Ethyl Acetate → HCID 66733853, compound

Participants

Reaction Conditions

Reaction Steps

A slightly yellow homogeneous solution of 1-iodo-3-methyl-8-[2-(4-trifluoromethyl-phenyl)-ethyl]-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester (1.500 g; 2.802 mmol) in anhydrous DMF (15 ml) was treated successively at rt with tris(dibenzylideneacetone)dipalladium(0) (82 mg; 0.090 mmol), triphenylphosphine (91 mg; 0.350 mmol), and finally with tributyl(vinyl)tin (1.63 ml; 5.604 mmol). The resulting mixture was heated to 90° C., under nitrogen, for 20 h. The reaction mixture was cooled to rt, EA (200 ml) was added, and the resulting solution was washed with water (2×125 ml). The resulting yellow organic layer was dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure to give an orange oil. Purification by FC (DCM/MeOH=40/1) gave the pure product 3-methyl-8-[2-(4-trifluoromethyl-phenyl)-ethyl]-1-vinyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester as a yellow solid (0.936 g; 77%). LC-MS: tR=0.88 min.; [M+H]+=436.48 g/mol.

Provenance & Evidence