Reference of 33332-28-4, These common heterocyclic compound, 33332-28-4, name is 2-Amino-6-chloropyrazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
Preparation of 3-bromo-6-chloropyrazin-2 -amine (B-10-3).-10-2 B-10-3 B-10-3bTo a solution of compound B-10-2 (110 g, 0.85 mol) in CHCI3 (1.5 L) was added N-bromo-succinimide (151.3 g, 0.85 mol) portionwise at O0C under N2 atmosphere. After the addition, the reaction mixture was warmed to room temperature and stirred overnight. TLC (petroleum ether/EtOAc 3:1 ) indicated most of compound B-10-2 was consumed. The reaction mixture was washed with saturated Na2CO3 (1 L x 3), H2O (1 L x 3) and saturated aqueous NaCI (1 L) in sequence, dried over Na2SO4 and concentrated in vacuo. The residue was purified via column chromatography (silica gel, EtOAc/hexane 1 :20) to yield pure B-10-3b (35 g) and pure compound B-10-3 (45 g, 28%) as a yellow solid.
The synthetic route of 33332-28-4 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; PFIZER INC.; WO2009/16460; (2009); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem