Methyl chloroformate → HCID 118491993, compound

Participants

Reaction Steps

To a solution of (1S,8aS)-N-((R)-1-(3-chloro-5-(trifluoromethyl)phenyl)ethyl)-N-methyl-6-oxo-1-o-tolylhexahydropyrrolo[1,2-a]pyrazine-2(1H)-carboxamide (300 mg, 0.61 mmol) in anhydrous THF (20 mL) under N2 atmosphere was added LiHMDS (2.3 mL, 1 M in THF, 2.3 mmol) at −60° C. The reaction was stirred for 30 min followed by addition of methyl carbonochloridate (134 mg, 1.43 mmol). After stirring for another 3 h at room temperature, the reaction was quenched with water at 0° C. and then extracted with EtOAc (2×30 mL). The combined organic layers were dried over anhydrous Na2SO4 and then concentrated in high vacuum. The residue was purified by silica gel chromatography (DCM/MeOH=20/1 to 10/1) to give the title compound (220 mg, yield: 59%); m/z (ES+): 610 [M+H]+.

Provenance & Evidence