5-Bromo-2-methyl-4-pyrimidinecarboxylic acid:Exports & Compliance White Paper 2026

I. Executive Summary

5-Bromo-2-methyl-4-pyrimidinecarboxylic acid (CAS 100707-39-9; C6H5BrN2O2; Mr 217.02) is a trifunctional heteroaryl building block combining an electron-deficient diazine ring, a carboxylic acid at the activated C4 position and a bromide at C5. The three groups are mutually productive: the acid is the standard attachment point for amide and ester libraries, the bromide is a reserved handle for cross-coupling, and the two ring nitrogens lower lipophilicity while offering hydrogen-bond-acceptor interactions valued in medicinal design. It is traded only as a research-grade intermediate with no indication of its own.

Demand follows the steady expansion of pyrimidine-containing portfolios, where this substitution pattern offers rigidity with low lipophilicity in one small fragment. Volumes stay in the development range, typically kilograms to low hundreds per programme, built around a defined route rather than stock. Supply is constrained less by raw material than by plants able to manage two hazards well: decarboxylation during isolation and drying, and palladium residues from early coupling steps.

This paper addresses what sourcing managers, quality officers and CDMO partners need: the properties that decide drying and shipping practice; the cyclocondensation routes that build the ring and their regiochemistry; amide formation and decarboxylation risks; the application matrix; capacity, pricing and export behaviour; the regulatory load carried by REACH, CLP, TSCA and ICH Q7, Q11, Q3C, Q3D and M7; ESG and traceability; and strategy across China, India and the European Union.

II. Product Deep Dive: Molecular Mechanisms and Production Evolution

2.1 Physicochemical Properties and Mechanisms

The compound is normally supplied as a free-flowing off-white to pale beige crystalline powder with high polarity and correspondingly poor solubility in non-polar media. It dissolves in polar aprotic solvents and in aqueous base, where it forms the corresponding carboxylate, and only sparingly in neutral water and alcohols. Its acidity is strengthened by the adjacent ring nitrogens, so the acid behaves as a genuinely polar, salt-forming fragment rather than as the lipophilic aromatic acid its structure at first suggests.

• An Activated, Ring-Adjacent Acid: The carboxyl group sits beside an electron-deficient diazine, which makes it easy to activate for amidation yet easy to lose. In practice the acid converts cleanly to activated esters or acid chlorides for amide libraries, but aggressive chlorinating reagents can also substitute the ring, so byproduct profiles from amidation are route-specific and must be specified rather than assumed.
• Decarboxylation and Thermal Margin: Pyrimidinecarboxylic acids lose carbon dioxide on warming far more readily than benzoic acids, because the ring stabilises the intermediate formed. Every drying, milling and shipping decision must therefore respect a calorimetrically established thermal margin, and specifications should name the decarboxylated product as an impurity, since its formation is invisible unless specifically sought.

2.2 Synthesis and Manufacturing Technologies

Industrial supply rests overwhelmingly on cyclocondensation, the classical union of a three-carbon 1,3-dicarbonyl equivalent with an amidine to build the diazine ring in one step, followed by functional-group operations. Some programmes instead assemble the ring already bearing the bromide by using a halogenated three-carbon component, while others install bromine last by electrophilic halogenation of the completed heterocycle. The choice is dictated by which route delivers acceptable regiochemistry and by where the inevitable purification burden is cheapest to carry.

• Regiochemistry of Ring Construction: Unsymmetrical three-carbon partners can condense in either orientation, placing the carboxylate at C4 or isomerically elsewhere on the ring. Competent developers select partners whose electronic bias favours one outcome, then confirm it structurally rather than by analogy, and finally control the alternative isomer to a specified level using a chromatographic or crystallisation step tailored to the polarity difference.
• Low-Temperature Isolation and Drying: Because the acid can decarboxylate, isolation is designed around low thermal exposure: precipitation or crystallisation from aqueous media, filtration without hot nitrogen purges, and vacuum drying below a temperature justified by calorimetric data. Stringent operations pair that with trended loss-on-drying and water results and with a stability-indicating assay that quantifies the des-bromo, decarboxylated and ring-substituted byproducts individually.

2.3 Core Application Matrix

• Amide and Ester Library Gateway: The dominant use is conversion of the acid into libraries of carboxamides and esters through standard activation chemistry, giving rapid structure-activity exploration around a low-lipophilicity core prized in modern fragment-led design.
• Cross-Coupling at the Retained Bromide: Because the acid can be derivatised first and the bromide consumed afterwards, the molecule supports a second diversification axis: Suzuki-Miyaura, Sonogashira and cyanation reactions at C5 build elaborated analogues without disturbing an already installed amide.
• Heterocycle Replacement Studies: The fragment is also used to replace phenyl or pyridine units in existing leads, where the two ring nitrogens reduce lipophilicity and improve solubility without adding rotatable bonds.

III. Global Market Supply-Demand Landscape and Export Trends

3.1 Demand Drivers and Market Shifts

Three drivers dominate. First, medicinal chemistry continues to shift toward heteroaromatic fragments with lower lipophilicity, and small diazines deliver exactly that combination of properties. Second, the acid plus bromide pairing supports two genuinely independent diversification axes, so it enters fragment-growing programmes early and follows them into development. Third, agrochemical discovery increasingly uses pyrimidine carboxamides, adding a second and less cyclical pull. Together these keep demand broad and shallow rather than concentrated in one blockbuster.

3.2 Capacity Distribution and Export Flows

Chinese producers in Shandong, Jiangsu and Zhejiang are backward integrated into amidines and halogenated precursors, making them the default source at scale. Indian suppliers in Gujarat and the Hyderabad corridor compete on route-development speed and documentation, often winning campaigns where amidation follows downstream. European plants in Germany, Switzerland and Italy offset higher cost with confidentiality, analytical depth and proximity to clinical manufacturing.

3.3 Market Bifurcation and Pricing Dynamics

Pricing splits along documentation rather than purity alone. Catalogue lots serve exploratory chemistry at comparatively high unit price and low commitment. Development campaigns introduce validated methods, named impurity limits, calorimetric drying justification and change control, and command a premium that reflects analytical labour more than yield. Retesting intervals also matter commercially: a supplier demonstrating real-time stability can extend shelf life and reduce write-offs, which for a thermally sensitive acid is worth more than a small discount.

IV. In-depth Analysis of Global Compliance and Regulatory Barriers

Because this compound is almost always an intermediate rather than a product in its own right, compliance arrives through the customer's filing. Two tracks matter: inventory status, registration tonnage, classification and the safety data sheet, together with any intermediate registration relied upon; and process-derived quality, meaning residual palladium and phosphorus, class 2 solvent residues, and genotoxic-impurity reasoning on reagents used in the route.

4.1 European Market: REACH, CLP, and Sector-Specific Directives

• REACH Registration and Intermediate Status: Importers must establish whether the dossier is a full registration, whether it relies on transported-isolated-intermediate conditions with strictly controlled handling, or whether tonnage needs its own submission, and non-EU manufacturers must name an Only Representative. Buyers should also check that the exposure scenarios describe their own operations, since local incorporation of scenarios into the downstream safety assessment is obligatory.
• CLP Classification and Documented Justification: Classification is self-assessed for this substance and generally addresses skin and eye irritation and target-organ effects, with the usual obligation to track periodic adaptations to technical progress. Given that the acid is acidic and handled as a dust, good suppliers also record particle-size and dustiness information so that downstream occupational assessments are based on measurement rather than on conservative default assumptions.

4.2 North American Market: TSCA, EPA, and FDA Regulations

• TSCA Inventory and Reporting: Import requires an active inventory listing, because inactive status forces pre-manufacture notification clearance ahead of first entry and can delay a campaign by months. Importers above the relevant threshold should also confirm whether Chemical Data Reporting cycles apply, since the obligation attaches to the importer rather than to the overseas manufacturer.
• FDA-Facing Quality Expectations: The regulator approves applications rather than intermediates, so this material enters through the applicant's chemistry and manufacturing controls section, often supported by a referenced type II drug master file and letter of access. Under ICH Q11 the applicant must justify the starting-material position and demonstrate impurity fate and purge, which makes the supplier's impurity package, including residual palladium data, decisive in supplier selection.

4.3 The Critical Hurdle: Quality Control and Safety Limits

V. Green Trade Barriers and ESG in Manufacturing

Two features drive the environmental profile. Ring construction and halogenation generate nitrogen-rich and saline effluents, where total nitrogen and absorbable organic halogen are directly consented parameters in China and India, while chromatographic purification for regioisomer control multiplies solvent waste. For a material made in kilogram quantities, solvent intensity per kilogram of product can greatly exceed that of commodity chemicals, so the relevant question for buyers is not absolute emissions but intensity, tracked consistently and disclosed honestly.

5.1 Carbon Footprint and Circular Economy

The strongest improvements come from replacing chromatography with crystallisation, which removes the largest solvent contributor and usually raises recovery, and from recovering palladium rather than discarding carbon and filter cake. Process mass intensity and solvent-recovery figures should be requested per campaign, since they compare cleanly between bidders. European customers should meanwhile track whether carbon border adjustment is extended beyond its present sector list.

5.2 Sustainable Sourcing and Traceability

Palladium provenance is the distinctive traceability question here. Precious metal is a regulated material in most producing jurisdictions, so reputable plants document receipts, recovery contractor identities and metal losses per batch, which simultaneously resolves customer questions about supply ethics and about cross-contamination. Combining that with ammonia and nitrile raw-material records, ISO 9001, ISO 14001 and ISO 45001 certification and readiness for shared sustainability assessment gives the traceability file needed by both auditors and future due-diligence rules.

VI. Supply Chain Resilience and Export Logistics

Logistics for this acid are governed less by hazard class than by physical stability. It is a polar, non-volatile dust that most commonly ships as non-classified cargo once acute toxicity, irritation and dust explosibility data support that conclusion, although some diazine intermediates do attract irritant classification and every claim requires testing rather than assumption. The genuine risks are absorbed moisture raising water content above specification, and excessive warmth during transport accelerating decarboxylation before the lot has even been released.

6.1 Packaging Standards and Moisture/Contamination Control

• Moisture-Barrier Packaging: Standard construction is a conductive polyethylene liner inside a second sealed liner, closed dry inside a fibre or UN-certified drum, with desiccant outside the product liner and net weights limited to twenty-five kilograms. Because the material drifts out of specification as it absorbs moisture, water should be tested on receipt as well as at release.
• Dust Control and Container Compatibility: Fine powder requires antistatic liners, earthing during transfer and containment appropriate to the occupational exposure band derived from the toxicity data. Contact parts should be specified as certified stainless steel or compatible polymer, since phosphorus and halide residues from upstream chemistry can promote discolouration where inappropriate metals are used, and retain samples must be stored under the same conditions as the shipped lot.

6.2 Dangerous Goods Identification and Transit Protocols

Where testing supports classification, consignments move under IMDG Code, ADR and RID and IATA provisions with certified packaging and trained-shipper documentation; otherwise they travel as general cargo on a documented rationale. Temperature is the operative measure either way: summer routes through hot hubs warrant temperature-controlled capacity, loads must never sit in steam-heated holds, and receivers should record arrival temperature so any elevated water or decarboxylation result can be attributed rather than argued over.

VII. Enterprise Global Expansion Strategy Guide

Because buyers change intermediates reluctantly, the winning supplier is the one whose development package survives the customer's own chemistry review without iteration. That advantage rests less on price than on demonstrated control of two things buyers fear: palladium carryover and silent thermal degradation. The three measures below convert those controls into arguments that catalogue vendors cannot match in a tender, and each costs little compared with the re-validation avoided.

1. Dual-Qualify Across Jurisdictions: Hold one primary source in China or India and a second in the European Union, each with independently validated analytical methods and its own calorimetric drying justification. Two lines inside one supplier group share utilities, contractors and management systems, so qualifying them protects commercial relationships while leaving the actual supply-chain risk untouched.
2. Write the Whole Specification Down: Contract named limits for the decarboxylated product, the regioisomer and any ring-substituted byproduct, palladium by inductively coupled plasma against ICH Q3D, ICH Q3C solvent limits, water content by direct titration, plus a documented ICH M7 position on alerting reagents, all under binding change control over route, solvent class, site, drying conditions and analytical method.
3. Separate RUO and GMP Campaigns: Run research campaigns with material labelled RUO, carrying no therapeutic claims and shipped with documented end-use declarations, while any campaign contributing to a filing runs to ICH Q7 from a declared step with a technical package or drug master file and customer-audit readiness. Clear tiering protects both parties and converts single orders into multi-year framework agreements.

VIII. Conclusion

5-Bromo-2-methyl-4-pyrimidinecarboxylic acid earns its place because it compresses three useful features into six carbons: a low-lipophilicity diazine core, an activatable acid and a reserved coupling handle. Since the prevailing direction in both pharmaceutical and agrochemical design favours fragments that add polarity without adding rotatable bonds, this substitution pattern should remain in demand well beyond any individual programme that currently uses it.

The commercial lesson is that value sits in control rather than in nameplate purity. Buyers who specify palladium, decarboxylation and regioisomer endpoints, require calorimetric justification of drying, and dual-qualify across China, India and the European Union avoid the failures that cost programmes months. Suppliers investing in crystallisation, noble-metal recovery and honest itemised certificates will find this small molecule supports unusually durable relationships.

IX. Industry Resource Connection and Supplier Ecosystem

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This white paper is exclusively compiled by the Guidechem Intelligence Team based on global customs data, regulatory databases, and industry research. Guidechem is a leading global B2B chemical platform, dedicated to connecting global buyers with verified, high-quality manufacturers.

Guidechem Global 5-Bromo-2-methyl-4-pyrimidinecarboxylic acid Supplier Ecosystem List

Relying on Guidechem's extensive global database, we have mapped the core participants in the current global 5-Bromo-2-methyl-4-pyrimidinecarboxylic acid supply chain:

• China Ecosystem: Shandong, Jiangsu and Zhejiang plants integrate backward into amidines and three-carbon precursors, giving them cost leadership at scale and the shortest route to kilo quantities.
• India Ecosystem: Gujarat and Hyderabad suppliers win on route-development speed and English documentation, particularly where custom amide and coupling chemistry follows the delivered acid.
• European Union Ecosystem: German, Swiss and Italian kilo-plants offset higher cost with confidentiality, analytical depth and proximity to clinical manufacturing for time-critical campaigns.