Bis(2-oxo-3-oxazolidinyl)phosphinic chloride → 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-5-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-pyrazole-3-carboxylic acid methyl ester

Participants

Reaction Steps

To 1 g 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-1H-pyrazole-3,5-dicarboxylic acid 3-methyl ester in 10 ml DCM and 1.4 ml NEt3, 667 mg BOP-Cl were added at RT and the mixture was stirred for 30 min. After addition of 563 mg 1-Isopropyl-piperidin-4-ylamine hydrochloride the mixture was stirred for 16 h. After removal of the solvent under reduced pressure the residue was purified by silica gel chromatography eluting with DCM/MeOH/AcOH/H2O 20:10:1:1 to yield a white solid. Yield: 800 mg MS (ES+): m/e=492, chloro pattern.

Provenance & Evidence