Azetidine HCl for Azetidin-2-yl Boronic Ester Synthesis
Bulk Supply Chain Integrity: Preventing Hygroscopic Degradation of Azetidine Hydrochloride During Winter Shipping and Long-Term Drum Storage
For process chemists scaling azetidin-2-yl boronic ester synthesis, the hygroscopic nature of azetidine hydrochloride (CAS 36520-39-5) demands rigorous supply chain controls. This heterocyclic compound, also known as trimethyleneimine hydrochloride or azacyclobutane hydrochloride, readily absorbs atmospheric moisture, leading to hydrolysis that compromises subsequent Miyaura borylation. At NINGBO INNO PHARMCHEM, we address this by supplying the material in 210L HDPE drums with dual-layer aluminum foil heat-sealed liners under nitrogen blanket. Each drum is palletized and stretch-wrapped to prevent physical damage during transit. For larger campaigns, 1000L IBCs with nitrogen purging ports are available. A critical non-standard parameter we monitor is the water content after 72-hour simulated shipping at -10°C and 85% relative humidity; our packaging maintains <0.1% water pickup, verified by Karl Fischer titration on retained samples. This ensures that the azetidinium chloride arrives with reactivity intact for immediate use in boronic ester formation.
Storage Requirement: Store at 2–8°C in a dry, well-ventilated area. Drums must be resealed under nitrogen after each use. Do not expose to humidity above 40% RH for more than 30 minutes during dispensing.
For related applications, our azetidine hydrochloride for CsPbI3 perovskite wet-film treatment demonstrates similar moisture-sensitive handling protocols that are directly transferable to boronic ester synthesis workflows.
Crystallization Handling and Cold-Chain Logistics: Mitigating Solidification Risks in Sub-Zero Transport for Azetidin-2-yl Boronic Ester Precursors
Azetidine hydrochloride exhibits a melting point of approximately 168–170°C, but field experience reveals a subtle behavior: at temperatures below -5°C, the crystalline solid can undergo a phase transition that increases friability, generating fines that complicate dispensing in gloveboxes. This is particularly relevant when shipping to northern European or Canadian sites during winter. Our logistics team employs validated thermal blankets and phase-change materials in insulated containers to maintain a temperature window of 5–15°C throughout transit. For air freight, we use active temperature-controlled ULDs. Upon receipt, if the material has been exposed to sub-zero temperatures, we recommend allowing the sealed drum to equilibrate to 20–25°C for 24 hours before opening to prevent condensation. This cold-chain expertise ensures that the 1,3-propylenimine hydrochloride arrives as free-flowing crystals, ready for precise weighing into boronic ester reactions. The German-language guide on Azetidine Hydrochloride für CsPbI3-Perovskit-Nassfilmbehandlung provides additional cold-storage insights applicable to this precursor.
Trace Water Control in Azetidine Hydrochloride: Impact on Boronic Ester Hydrolysis and Suzuki-Miyaura Coupling Efficiency
In the synthesis of azetidin-2-yl boronic esters, even 0.5% water in azetidine hydrochloride can hydrolyze the boronic ester product, reducing yields in subsequent Suzuki-Miyaura couplings. Our manufacturing process for tetrahydro-azete hydrochloride includes a final drying step under high vacuum at 40°C for 16 hours, achieving water content consistently below 0.2% (please refer to the batch-specific COA). We also monitor trace amine impurities via GC headspace; residual free amine can form azeotropes with water, complicating drying. A non-standard parameter we track is the color after 6-month storage at 25°C: our material remains white to off-white, whereas competitor samples may yellow due to amine oxidation, indicating moisture ingress. For boronic ester homologation, we recommend using freshly opened drums and performing a Karl Fischer check before charging. This level of control makes our azetidine hydrochloride a reliable drop-in replacement for existing suppliers, matching technical specifications while offering competitive lead times.
Solvent Compatibility and Drum Sealing Protocols: Ensuring Anhydrous Conditions for Seamless Scale-Up to API Manufacturing
Azetidine hydrochloride is freely soluble in water and methanol, sparingly soluble in THF and dichloromethane. For boronic ester synthesis, the typical solvent is anhydrous THF or 2-MeTHF. Our packaging is validated for solvent compatibility: the HDPE drum and aluminum foil liner show no extractables after 48-hour contact with THF at 25°C. After dispensing, the drum must be resealed immediately using the original clamp ring and a fresh nitrogen purge. We supply each drum with a detailed sealing protocol sticker. For multi-kilogram campaigns, we offer split-packaging in 25kg UN-rated fiber drums with internal aluminum bags, minimizing headspace and moisture exposure per aliquot. This attention to solvent compatibility and sealing integrity ensures that the azetidine hydrochloride maintains anhydrous conditions from our warehouse to your reactor, supporting seamless scale-up to API manufacturing.
Drop-in Replacement Strategy: Matching Technical Specifications and Lead Times for Azetidine Hydrochloride in Multi-Kilogram Campaigns
As a global manufacturer, NINGBO INNO PHARMCHEM positions its azetidine hydrochloride as a drop-in replacement for major suppliers. Our typical specification includes assay ≥98.0% (HPLC), water ≤0.5%, and residue on ignition ≤0.1%. We maintain safety stock of 500kg in our Shanghai warehouse, enabling shipment within 5 working days for orders up to 100kg. For larger quantities, lead time is 3–4 weeks. Our supply chain reliability is backed by dual-source raw material qualification and a documented change-control process. By matching the technical parameters of incumbent suppliers, we allow procurement managers to qualify our material with minimal analytical revalidation. The azetidine hydrochloride is identical in performance for azetidin-2-yl boronic ester synthesis, as confirmed by several CDMO partners. For custom synthesis requirements or to validate our drop-in replacement data, consult with our process engineers directly.
Frequently Asked Questions
How do packaging specifications mitigate hygroscopic uptake during transit?
Our 210L drums feature dual aluminum foil liners heat-sealed under nitrogen, with a desiccant pouch between layers. This configuration limits water vapor transmission to <0.01 g/m²/day, ensuring that even during 30-day ocean freight, the azetidine hydrochloride picks up less than 0.1% moisture. For air freight, we add a vacuum-sealed outer bag. Each shipment includes a humidity indicator card inside the liner; if the card shows >30% RH upon receipt, we recommend rejecting the drum.
What storage humidity thresholds preserve reactivity for boronic ester homologation?
To maintain reactivity for azetidin-2-yl boronic ester synthesis, store azetidine hydrochloride at <40% relative humidity and 2–8°C. After opening, the headspace should be purged with dry nitrogen and the drum resealed within 30 minutes. Long-term storage under these conditions shows no loss of assay or increase in water content over 12 months. If the material is exposed to >60% RH for more than 1 hour, it should be re-dried under vacuum at 40°C before use.
What drugs are based on azetidine?
Azetidine derivatives are found in several drug classes, including fluoroquinolone antibacterials, carbapenem antibiotics, and tachykinin antagonists. The 3-amino-azetidine scaffold is a key intermediate in these pharmaceuticals, highlighting the importance of high-purity azetidine hydrochloride as a building block.
How to prepare boronic ester?
Boronic esters are typically prepared by reacting an organometallic reagent (e.g., Grignard or organolithium) with a trialkyl borate, followed by hydrolysis. Alternatively, Miyaura borylation uses a palladium catalyst to couple bis(pinacolato)diboron with an aryl halide. For azetidin-2-yl boronic esters, the corresponding azetidine hydrochloride is first converted to the free amine, then protected and metalated.
What is the difference between Boronate ester and boronic ester?
A boronic ester has the general formula RB(OR')2, where R is a carbon-based group and R' is typically an alkyl group. A boronate ester is a salt or ester of a boronic acid, often with a tetrahedral boron center, e.g., R-B(OR')3⁻. In Suzuki couplings, boronic esters are the active species, while boronates are sometimes used as protected forms.
What are the alternative names for azetidine?
Azetidine is also known as azacyclobutane, trimethyleneimine, 1,3-propylenimine, and tetrahydro-azete. Its hydrochloride salt is referred to as azetidine hydrochloride, azetidinium chloride, or azacyclobutane hydrochloride.
Sourcing and Technical Support
NINGBO INNO PHARMCHEM provides azetidine hydrochloride with the supply chain rigor and technical support required for demanding boronic ester synthesis. Our drop-in replacement strategy minimizes requalification effort while ensuring consistent quality. For custom synthesis requirements or to validate our drop-in replacement data, consult with our process engineers directly.