Hydrochloric Acid → HCID 67188117, compound

Participants

Reaction Steps

To a solution of 5-bromo-2-methyl-pentanoic acid (1.79 g, 9.2 mmol, 1 eq) in anhydrous DCM (8 mL) oxalyl chloride (1.0 mL, 12.0 mmol, 1.3 eq) was added dropwise and the mixture was stirred at room temperature for 16 hours. After evaporation of the solvent and the excess oxalyl chloride, the residue was dissolved in anhydrous DCM (8 mL) and a solution of 5-amino-3-(4-chloro-phenyl)-pyrazole-1-carboxylic acid tert-butyl ester (2.7 g, 9.2 mmol, 1.0 eq) and triethylamine (1.7 mL, 12 mmol, 1.3 eq) was added dropwise at 0° C. The mixture was allowed to reach room temperature and stirred at room temperature for 24 hours, after which another 0.5 eq of activated 5-bromo-2-methyl-pentanoic acid was added. HCl 1M was added; the crude was extracted with DCM and purified through SiO2 column (eluent DCM) to give 3.3 g (yield 97%) of the title product.

Provenance & Evidence