反应详情

According to the general procedure (GP10), microwave-assisted Pictet-Spengler reaction (60 W; 140° C.; 6.5 bars; 10 min.) between 2-(2-ethyl-4-iodo-imidazol-1-yl)-ethylamine (1.540 mmol) and (4-fluoro-3-trifluoromethyl-phenoxy)-acetaldehyde (0.342 g; 1.540 mmol) afforded 3-ethyl-8-(4-fluoro-3-trifluoromethyl-phenoxymethyl)-1-iodo-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine. Subsequent protection of the secondary amine, and purification by FC (DCM/MeOH=60/1) allowed the isolation of the pure product 3-ethyl-8-(4-fluoro-3-trifluoromethyl-phenoxymethyl)-1-iodo-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester as a yellow solid (0.412 g; 47%). LC-MS: tR=0.93 min.; [M+H]+=570.37 g/mol.