Triethylamine → HCID 57518484, compound

Participants

Reaction Steps

(R)-7-[3-tert-Butoxycarbonylamino-4-(2,4,5-trifluoro-phenyl)-butyryl]-3-trifluoromethyl-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid 2a (180 mg, 0.33 mmol) was dissolved in 10 mL of tetrahydrofuran, and ethylamine hydrochloride (269 mg, 3.3 mmol), bis(2-oxo-3-oxazolidinyl)phosphinic chloride (168 mg, 0.66 mmol) and triethylamine (367 mg, 3.63 mmol) were then added to the solution. The reaction mixture was stirred at room temperature for 4 hours until thin lay chromatography showed the starting material disappeared, and then filtered and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography to obtain the title compound (R)-[3-(1-ethylcarbamoyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl)-3-oxo-1-(2,4,5-trifluoro-benzyl)-propyl]-carbamic acid tert-butyl ester 42a (190 mg, yield>100%) as a white solid.

Provenance & Evidence