Ethanol → HCID 18319926, compound

Participants

Reaction Steps

4-Oxo-1-piperidinecarboxylic acid 1,1-dimethylethyl ester (0.053 mol), 1-[(4-fluorophenyl)methyl]-1H-imidazol-2-amine and titanium(IV)isopropoxyde (0.055 mol) were stirred at 50° C. for 2 hours. Ethanol (350 ml) and sodium borohydride (0.53 mol) were added. The mixture was stirred at RT overnight and water was added. The mixture was filtered over decalite, washed with ethanol/CH2Cl2 and the solvent was evaporated. The residue was taken up in CH2Cl2, dried, filtered and the solvent was evaporated. The residue was purified over silica gel on a glass filter (eluent: CH2Cl2/CH3OH 100/0, 99/1, 98/2, 97/3, 96/4 and 94/6). The pure fractions were collected and the solvent was evaporated. The residue was crystallized from DIPE and the precipitate was filtered off and dried, yielding 11.3 g (57%) of 1,1-dimethylethyl 4-[[1-[(4-fluorophenyl)methyl]-1H-imidazol-2-yl]amino]-1-piperidinecarboxylate (intermediate 29).

Provenance & Evidence