Dimethylformamide → ethyl 4-[[1-[(2-methyl-5-oxazolyl)methyl]-1H-benzimidazol-2-yl]amino]-1-piperidinecarboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of 23 parts of 5-(bromomethyl)-2-methyloxazole, 57.6 parts of ethyl 4-[(1H-benzimidazol-2-yl)amino]-1-piperidinecarboxylate, 26.5 parts of sodium carbonate and 470 parts of N,N-dimethylformamide was stirred for 18 hours at 80° C. The reaction mixture was poured into water and the whole was extracted with 4-methyl-2-pentanone. The extract was washed with water, dried, filtered and evaporated. The residue was stirred in acetonitrile. The precipitate was filtered off and the filtrate was evaporated. The residue was purified by column chromatography (silica gel; CH2Cl2 /CH3OH 90:10). The eluent of the desired fraction was evaporated, yielding 6 parts (11.2%) of ethyl 4-[[1-[(2-methyl-5-oxazolyl)methyl]-1H-benzimidazol-2-yl]amino]-1-piperidinecarboxylate (comp. 2).

Provenance & Evidence