These common heterocyclic compound, 28466-26-4, name is 4-Aminopyrazole, 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. COA of Formula: C3H5N3
Neat 1 H-pyrazol-4-amine (55.2 mg, 0.66 mmol) was added in one charge to a stirred solution of 5-bromo-2-[(phenylmethyl)oxy]benzoic acid (may be prepared as described in Description 5, method D; 170 mg, 0.55 mmol), EDC (318 mg, 1.66 mmol) and HOBT (254 mg, 1.66 mmol) in N,N-dimethylformamide (4 ml) in air at room temperature. The reaction mixture was stirred at room temperature overnight. Water (30 ml) was added, and the mixture was extracted with ethyl acetate (50 ml x 2). The organic layers were combined, dried over MgSO,,, and concentrated in vacuo. The residue was washed with ethyl acetate yield the title compound as a brown solid. 180 mg.1HNMR (400 MHz, DMSO-c/6): 5.26 (s, 2H), 7.24 (d, 1 H), 7.35-7.45 (m, 4H), 7.52 (d, 2H), 7.65-7.68 (m, 1 H), 7.77 (d, 1 H), 7.93 (s, 1 H), 10.21 (s, 1 H), 12.66 (s, 1 H).MS (electrospray): m/z [M+H]+ = 372
The synthetic route of 4-Aminopyrazole has been constantly updated, and we look forward to future research findings.
Reference:
Patent; GLAXO GROUP LIMITED; GLAXOSMITHKLINE (CHINA) R&D COMPANY LIMITED; NICHOLS, Paula Louise; EATHERTON, Andrew John; BAMBOROUGH, Paul; JANDU, Karamjit Singh; PHILPS, Oliver James; ANDREOTTI, Daniele; WO2011/38572; (2011); A1;,
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