Trifluoroacetic acid → HCID 10742872, compound

Participants

Reaction Steps

A mixture of 2-(4-bromo-2-fluorobenzyl)-4-ethoxycarbonyl-1,3-dioxo-1,2,3,4-tetrahydropyrrolo[1,2-a]pyrazine-4-acetic acid tert-butyl ester (28.7 g) and trifluoroacetic acid (125.1 g, 84.5 ml) in dichloromethane (100 ml) was refluxed for 3 hours and concentrated under reduced pressure. The residue was chromatographed on silica gel using chloroform as the eluent. Fractions containing the title compound were pooled and evaporated under reduced pressure. The residue was recrystallized from ethyl acetate/n-hexane to give the title compound (21.4 g, 3.6%) as colorless crystals, mp 142°-144° C.

Provenance & Evidence