Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 871239-17-7, name is 3-Bromo-1-(2-chlorophenyl)-1H-pyrazole-5-carboxylic acid, This compound has unique chemical properties. The synthetic route is as follows., Recommanded Product: 3-Bromo-1-(2-chlorophenyl)-1H-pyrazole-5-carboxylic acid
Step H: Preparation of 2-[3-bromo-1-(2-chlorophenyl)-1H-pyrazol-5-yl]-8-methyl-4- oxo-4H-3,1-benzoxazine-6-carbonitrile; To a solution of 3-bromo-1- (2-chlorophenyl)-1H-pyrazole-5-carboxylic (i. e. the carboxylic acid product of Step E) (2.0 g, 6.29 mmol) and 2-amino-3-methyl-5- cyanobenzoic acid (i. e. the product of Step G) (1.1 g, 6.29 mmol) in acetonitrile (60 mL) at room temperature was added 3-picoline (3.2 mL, 32.7 mmol). The reaction mixture was stirred for 5 minutes and then cooled to-10 C. Methanesulfonyl chloride (1.3 mL, 16.4 mmol) was then added dropwise, and after completion of the addition the reaction mixture was warmed to room temperature. On stirring overnight at room temperature, the reaction mixture formed a solid precipitate. The solid was isolated by filtration, washed with water, dissolved in excess methylene chloride and dried (MgS04). After removal of solvent, the residue was purified by chromatography on silica gel to afford the title compound (1.9 g). ¹H NMR (CDCI3) No. 8.31 (s, 1 H), 7.73 (s,lH), 7.45-7.6 (m, 4H), 7.31 (s,lH), 1.84 (s,lH).
Chemical properties determine the actual use. Each compound has specific chemical properties and uses. We look forward to more synthetic routes in the future to expand reaction routes of 871239-17-7.
Reference:
Patent; E.I. DUPONT DE NEMOURS AND COMPANY; WO2005/118552; (2005); A2;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics