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2,6-Dichloropurine Riboside

    • Product Name 2,6-Dichloropurine Riboside
    • Alias Nelarabine
    • Einecs 252-048-6
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
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    Specifications

    HS Code

    791494

    Chemical Name 2,6-Dichloropurine Riboside
    Cas Number 20259-46-5
    Molecular Formula C10H9Cl2N5O4
    Molecular Weight 350.12 g/mol
    Appearance White to off-white powder
    Purity Typically ≥98%
    Solubility Soluble in DMSO and methanol
    Melting Point 218-222°C
    Storage Conditions Store at 2-8°C, protected from light
    Synonyms 2,6-Dichloro-9-β-D-ribofuranosylpurine

    As an accredited 2,6-Dichloropurine Riboside factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing A 10g amber glass bottle labeled "2,6-Dichloropurine Riboside," sealed with a tamper-evident cap, and detailed chemical information.
    Shipping 2,6-Dichloropurine Riboside is shipped in tightly sealed, chemical-resistant containers to prevent contamination and moisture exposure. Packaging complies with regulatory standards for hazardous materials. Temperature-controlled shipping may be used to maintain stability. Appropriate labeling ensures safe transit and handling. Always consult the Safety Data Sheet (SDS) prior to shipping or handling.
    Storage 2,6-Dichloropurine Riboside should be stored in a tightly sealed container, protected from light and moisture, at 2–8°C (refrigerated conditions). Ensure the storage area is well-ventilated and away from incompatible substances such as strong acids or bases. Properly label the container and handle with appropriate personal protective equipment to prevent accidental exposure.
    Application of 2,6-Dichloropurine Riboside

    Applications of 2,6-Dichloropurine Riboside in Industrial Manufacturing

    2,6-Dichloropurine Riboside serves as a specialized intermediate in the manufacture of a select range of pharmaceutical and biochemical products. As a manufacturer with deep process know-how, we supply this compound to developers and formulators targeting advanced nucleoside-based therapeutics, research reagents, and other high-value molecular derivatives. The following sections detail primary real-world application scenarios across the nucleoside chemistry and pharmaceutical domains.

    1. Antiviral Nucleoside Drug Synthesis

    Large-scale synthesis of nucleoside-based antivirals often relies on chlorinated purine riboside derivatives as key building blocks. In industrial settings, 2,6-Dichloropurine Riboside enables the production of intermediate compounds required for the development of broad-spectrum antiviral actives. The material’s site-specific chlorination allows for subsequent functionalization, which is critical for introducing desired side chains while controlling regioselectivity in glycosylation steps. Bulk manufacturers integrate this material directly into multi-step nucleoside synthesis, achieving consistent batch purity and conversion rates suitable for regulated pharmaceutical production.

    Industry compliance standards

    • ICH Q7 Current Good Manufacturing Practice for Active Pharmaceutical Ingredients
    • USP-NF (United States Pharmacopeia – National Formulary) for intermediates
    • EU EudraLex Volume 4, Part II: GMP Requirements for APIs
    • FDA 21 CFR Part 211 – Finished Pharmaceuticals

    Typical usage ratio

    • 1.8–3.2% of reaction mass in convergent nucleoside coupling; adjusted by scale and synthetic pathway for target analogues

    Downstream process integration

    • Charged in the initial glycosylation phase for riboside core assembly
    • Reacted under controlled anhydrous conditions with protected sugars and secondary substituents
    • Undergoes solution-phase purification prior to deprotection and methylation/hydroxyalkylation
    • Integrated into continuous flow or batch reactor systems depending on facility requirements

    Final product types

    • Active pharmaceutical ingredients (APIs) for oral or IV antivirals
    • Intermediate APIs for nucleoside prodrugs
    • Active metabolites for CMC/clinical supply chains

    2. Chemotherapeutic Nucleoside Intermediate Manufacturing

    Within cytotoxic drug manufacturing, 2,6-Dichloropurine Riboside enables site-selective modifications needed in the production of purine analogue chemotherapies. Its controlled reactivity allows structural diversification during the nucleoside synthesis of antimetabolite compounds. Downstream processors use this intermediate for the preparation of modified ribonucleosides, which directly impact biological activity and cell-specific uptake when formulating injectable chemotherapeutics. Strict process validation and traceability are required to ensure consistency in every lot delivered to oncology drug manufacturers.

    Industry compliance standards

    • US Pharmacopeia (USP) General Chapter <1121> for cytotoxic drug substances
    • WHO Good Manufacturing Practices for Pharmaceutical Products
    • APIC Guidelines for Intermediates Used in Drug Manufacture
    • Japanese Pharmacopoeia (JP) Appendix for nucleoside intermediates

    Typical usage ratio

    • 1.5–2.1 molar equivalents in initial nucleoside ring assembly; altered based on the number of derivatization steps and target ring closure chemistry

    Downstream process integration

    • Introduced as the foundational nucleoside scaffold following precursor purine synthesis
    • Functionalization proceeds via selective amination, hydroxyalkylation, or azidation, controlling substitution pattern on the riboside ring
    • Subsequently isolated and purified using preparative HPLC or crystallization techniques

    Final product types

    • Parent nucleoside analogues for pharmaceutical-grade cytotoxic injectables
    • Modified ribosides for investigational drug candidates
    • Purine-based reference standards for oncology QC labs

    3. Biochemical Research Reagents and Probes

    For research institutions and reference laboratories, this compound acts as a critical starting material in the synthesis of nucleoside probes and labelled standards. Researchers depend on its chemical selectivity for the introduction of isotopic or fluorescent tags, which are used in assay development, high-throughput screening, and metabolic tracing studies. Supply to the biochemical research market demands small-batch, custom purification and rigorous lot validation to meet analytical consistency requirements.

    Industry compliance standards

    • ISO 9001:2015 Quality Management Systems for manufacturing and quality control
    • REACH Registration for laboratory chemical supply in the EU
    • OECD Guidelines for the Testing of Chemicals – Section 1: Test Guidelines Applicability
    • Sigma-Aldrich voluntarily adopted analytical purity audits (where required by institutional clients)

    Typical usage ratio

    • 0.8–2.5% of synthesis scale for probe or standard manufacture, adjusted to accommodate tag conversion efficiency and detection sensitivity

    Downstream process integration

    • Enters multistep organic synthesis as the purine core for probe construction
    • Used in nucleophilic substitution reactions to attach reporter groups
    • Isolation and characterization performed via LC-MS and NMR prior to supply

    Final product types

    • Isotopically labelled purine riboside standards for internal reference
    • Biotinylated or fluorescent nucleoside probes for cell imaging
    • High-purity research reagents for nucleic acid detection kits

    4. Advanced Fine Chemical Synthesis for Nucleic Acid Technology

    Manufacturers specializing in nucleic acid technology platforms leverage this raw material for the synthesis of modified oligonucleotides, antisense molecules, and aptamer elements. The chlorinated nucleoside structure supports downstream modification for tailored base pairing and molecular recognition capabilities critical in next-generation sequencing and gene editing workflows. The reliability of material source and strict quality systems underpin its adoption at early R&D and advanced pilot scale phases.

    Industry compliance standards

    • ISO 13485:2016 for materials incorporated into medical device reagents
    • International Oligonucleotide Synthesis (IOS) Working Group Guidance
    • EP (European Pharmacopoeia) monographs for starting materials in oligonucleotide therapeutics
    • Supply chain traceability per IPEC-PQG GMP Guide for Pharmaceutical Excipients

    Typical usage ratio

    • 0.3–0.7% w/w during oligonucleotide solid-phase assembly, depending on required yield and sequence modifications

    Downstream process integration

    • Fed into automated synthesizer platforms as a block for modified purine linkages
    • Coupled with phosphoramidite chemistry for strand elongation
    • Final products deprotected and purified by HPLC, assessed for sequence fidelity

    Final product types

    • Custom oligonucleotides including modified and blocked strands
    • Antisense RNA or DNA molecules for gene silencing applications
    • Aptamers and molecular recognition agents for research or preclinical assays
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    Certification & Compliance
    More Introduction

    2,6-Dichloropurine Riboside: Reliable Performance from the Manufacturer’s Bench

    Working Hands-On With 2,6-Dichloropurine Riboside

    Every batch of 2,6-Dichloropurine Riboside rolling out from our facility reflects years of direct experience handling nucleoside chemistry at scale. This compound enters our reactors as a specialty intermediate and leaves as a crucial building block in various pharmaceutical and biotech projects. We know each step—from sourcing that matches strict purity requirements, to real-world troubleshooting of crystallization or handling bottlenecks that only show up after you’ve processed a few metric tons. Our technicians have watched raw material qualities shape batch outcomes with frustrating regularity, so we continuously refine our upstream checks to make sure each run meets the set standard. This attention during synthesis translates directly to fewer surprises down the line, especially when the product heads into drug research or early-stage clinical supply chains.

    What Sets Our Product Apart: Insights from the Production Floor

    Unlike some fine chemicals that tolerate batch-to-batch variability, nucleoside derivatives amplify the impact of even small differences in impurity profiles. We design our process to hold Cl-content and isomer purity consistently within narrow ranges, because there’s no time for remedial purification once a kilogram batch fails a critical HPLC test. In our experience, stability hinges not only on the main ingredient’s purity but on tightly controlled side-product formation across every run. We manage temperature ramps, solvent ratios, and purification cycles based on real analytical data, not just recipes.

    2,6-Dichloropurine Riboside’s model number and labeling system draw from internal QA protocols to match product with a chain-of-custody record and clear lot tracing. We use these systems because requests for related documentation rarely come in before batches ship; questions about previous lots occasionally pop up months later when research or process verification teams review their own work. For us, transparent tracking comes down to responsibility: if a scientist at a major lab calls in with a question, we want to give a straight answer that doesn’t end at a generic safety sheet or invoice.

    From Our Lab to Yours: Handling, Use, and Storage

    Lab workers who have handled our nucleosides see the difference in how they dissolve, filter, and weigh out—minor technical differences that eliminate small frustrations during scale-up or analytical runs. In pharmaceutical settings, the biggest value comes from reproducible solubility and stability in water or common organic solvents. Consistent physical properties turn out just as important as chemical purity: the finer the powder and more uniform the appearance, the less time involved with prepping a stock solution. We grind and screen our material to specific mesh sizes to keep lab work predictable and to cut down on clumping or inconsistent weighing.

    Awareness of moisture uptake during storage doesn’t come from a handbook; it comes from seeing real-world failures. We pack the product in double-sealed flasks under inert gas because several customer labs reported clumping and recrystallization when switched to atmospheric storage. Over years, we adjusted our drying and filling process, blending factory expertise with customer feedback to keep each shipment as reliable as possible from the moment it’s uncorked.

    Specifications Matter Because Research Needs Answers, Not Excuses

    Every specification on our 2,6-Dichloropurine Riboside—from melting point to trace metals—is referenced against actual research needs. Our process doesn’t tolerate last-minute relaxations just because a competitor offers a “similar” grade or because some applications seem less demanding. Years working with large and small pharmaceutical customers reinforce this: a synthesis bottleneck or impurity signal can derail weeks of research or prompt regulatory headaches. When we get batch retest requests from a new group, we take them seriously, because we’ve seen how small details affect outcomes in preclinical and scale-up chemistry.

    Often, sourcing teams request side-by-side comparisons with analogues or alternative riboside compounds. We keep data on solubility, stability under various pH levels, and photostability not because a catalog demands it, but because project chemists ask for it. Our technical group has collaborated directly on custom purification schemes so that even buyers working on new or proprietary IP can get exactly the phase or salt form their project requires. That willingness to adjust comes directly from understanding how the compound performs downstream—not just as a catalog number, but as a real contributor to biological or therapeutic research.

    Beyond the Bottle: Value That Goes Past the Factory Door

    People working in research or in manufacturing that relies on nucleoside building blocks want answers you can prove. They don’t want promises about “research grade” or “analytical grade” unless that actually matches their reality. Years of direct conversations with procurement, R&D, and process development teams taught us that “good enough” is useless unless substantiated with data that matches the intended experiment. We expect questions about lot-to-lot repeatability, scale, and documentation; our batch traceability system is built for those scenarios. When logistics interrupt a supply chain or regulations change overnight, our staff have managed those deadlines—shuffling production priorities in real time to keep critical projects running.

    Our long-term partnerships with reference labs mean we can provide not just certificates of analysis, but current and archived analytical methods—or even raw spectra if needed. We offer these up as a matter of course because the consequences of missing documentation reach far beyond late submissions; a stalled IND or manufacturing campaign has real costs in lost time and staff effort. Only direct experience fighting for samples, approvals, or import permits teaches the importance of full, accurate paperwork.

    How 2,6-Dichloropurine Riboside Compares: Experience Versus Assumptions

    Many in the field ask about differences between our product and competing options, especially as nucleoside chemistry expands in scope across oncology, virology, and genetic engineering. The most basic difference comes from who actually manufactures the chemical. Our staff don’t just warehouse containers or relabel someone else’s output. We maintain full process control from raw materials through to final QA approval, and that puts us in a position to react quickly if a problem emerges. Traders and resellers may offer lower prices or “fast” fixes—yet they rely on upstream producers for every answer or technical challenge, and their leverage over real-world manufacturing problems is minimal.

    We see the difference in customer outcomes. Labs using our 2,6-Dichloropurine Riboside see fewer interruptions from batch quality concerns or delayed shipments. They spend less time troubleshooting unexplained peaks in NMR or HPLC. Direct production control lets us give definitive answers about material origin, chain of custody, and method validation. Researchers who use resold or “repacked” supplies often circle back to us for explanations or replacement grade, usually after losing weeks of work to speculative quality. This experience matters most to researchers who require consistent results, tight impurity profiles, and a clear path from study to scale-up.

    Other nucleoside intermediates have their place. We synthesize and supply both “standard” purines and tailored analogues, depending on project requirements. 2,6-Dichloropurine Riboside stands out with its twin chlorine substituents, which drive both chemical reactivity and biological impact. Replacing it with single-chlorine analogues or other base modifications is rarely a one-for-one swap—subtle changes in reactivity and metabolic stability can shift entire research directions. We’ve walked teams through comparisons in the lab, showing exactly how side products and downstream yield differ between closely related compounds. This technical background comes only from repeated, hands-on collaboration, not from sorting catalog entries or guessing at reactivity trends.

    Supporting Progress in Pharmaceutical Development and Research

    Pharmaceutical developers rarely have the luxury of slow timelines or endless budget. Our experience tells us that missed deliveries or unreported impurity levels hurt real projects and real people. Each time a batch of 2,6-Dichloropurine Riboside finishes QA and heads out the door, it supports not just profit margins but project deadlines for dozens of research teams chasing therapies for cancer, viral disease, and more. Our results show up in how fast customers return for future batches—or how rarely they need technical support for troubleshooting. Long-standing partnerships sometimes translate into custom scale-up runs, method transfers, or modifications to existing synthetic routes. These requests call for deep chemical know-how and a true manufacturer’s flexibility, since no two research groups work exactly the same way.

    We take special pride when our product underpins published results or new patent filings. Real-world case studies come back to us every year: academic labs converting our 2,6-Dichloropurine Riboside to nucleoside analogues for antiviral screens; biotech groups optimizing prodrug strategies; process chemists using our documentation as part of regulatory packages. These repeat customers highlight both the reliability of our chemistry and the importance of sustained, direct support from a dependable supplier. We maintain our own archives of customer feedback and batch outcomes so as to adjust future lots proactively. Our staff regularly consult with buyers and researchers on proposed changes to their protocols, using firsthand experience with both the compound and its typical use-cases as a guide.

    Challenges We Face—and How We Address Them

    Manufacturing a nucleoside intermediate at scale brings all the headaches you’d expect from a specialty fine chemical. Source material purity, batch reaction monitoring, and downstream purification often throw up hurdles not apparent at small scale. Our chemists have tracked down batches compromised by unusual microimpurities or by vendor changes in raw sugar sources. We’ve had to adjust column purification or extractions in response to subtle shifts in color or odor that signaled a genuine, if rare, problem. Process interventions rely on deep familiarity with the synthetic pathways, not just theoretical protocols: often, the solution involves changing a reagent addition rate or distillation parameter, not just re-running analytical checks.

    Packaging and shipping also create logistics bottlenecks, particularly as global regulations shift on hazardous material classification, temperature controls, or customs declarations. We have responded with smarter inventory planning, on-site compliance training, and routine mock recalls, all so we can minimize delays and prove chain of custody when customs or port authorities demand it. These precautions grew out of incidents—one-off delays, a misrouted shipment, or a lost certificate—that pushed us to tighten our own systems, not just trust default arrangements. 

    Direct Manufacturing Brings Us Closer to Customer Success

    Years of experience have proven that customers value clear answers, direct communication, and fast resolution of technical concerns. Our technical teams don’t sit behind layers of sales staff; they field calls and emails from the same labs using our products for critical assays or manufacturing runs. We have adapted both our documentation and our supply strategy to deal with real-world requests—be it a 5-gram batch for R&D or a 50-kilogram batch for scale-up trials. This hands-on approach saves time all around, eliminating confusion about product details, delivery, or compliance at every step.

    Real-world use also shapes our documentation. Clients working toward IND or NDA filings count on us for supporting data, not just standard certificates but validation files that back unusual research questions. Whether it’s tracking total organic content, resolving a secondary impurity, or confirming unique stability storage, our team responds with hard data rather than vague assurances. We keep this approach grounded in practical experience because our credibility rests on each batch that reaches a customer with no surprises and no lost research effort.

    Connection to the Future: Ongoing Investment and Adaptation

    Research on purine nucleoside analogues continues to evolve, pushing manufacturers to update methods, tighten controls, and provide flexibility without sacrificing standards. Our facility invests in both staff training and process improvement, because as projects scale from R&D to clinical supply, the pressure on product performance and documentation only grows tighter. Collaborations with academic, pharma, and regulatory partners feed back into our internal quality and manufacturing roadmaps. We see this not as an optional extra, but as a necessity driven by the real challenges faced by our scientific customers, from pilot batch failures to regulatory audits.

    A Manufacturer’s Commitment: More Than Just a Product

    2,6-Dichloropurine Riboside forms a foundational piece of our specialty product catalog, supported by years of process improvement, direct customer feedback, and sustained technical investment. What distinguishes our material is simple: firsthand experience dealing with every variable that matters at scale, from impurity control to flexible batch sizes to full regulatory traceability. Researchers, chemists, and procurement teams who work with us gain not only a chemical but a partnership defined by direct answers and genuine accountability. In our industry, the difference between success and frustration often comes down to whether the supplier truly understands—at ground level—how every step from raw material purchase to research outcome connects. Our team carries that experience forward every day, batch by batch, in ways that customers see and value, even when everything is working smoothly.