反应详情

To a stirred mixture of 2.5 parts of lithium aluminum hydride and 225 parts of tetrahydrofuran was added dropwise a solution of 13 parts of 4-[[1-(2-thienylmethyl)-1H-benzimidazol-2-yl]amino]-1-piperidineacetonitrile in tetrahydrofuran under nitrogen atmosphere. Upon completion, stirring was continued for 3 hours at reflux. The reaction mixture was cooled in an ace bath and decomposed by the successive additions of 2.5 parts of water, 7.5 parts of a sodium hydroxide solution 15% and 7.5 parts of water. The whole was filtered over Hyflo and the filtrate was evaporated. The residue was crystallized from acetonitrile, yielding 9.5 parts (72%) of N-[1-(2-aminoethyl)-4-piperidinyl]-1-(2-thienylmethyl)-1H-benzimidazol-2-amine; mp. 137.1° C. (intermediate 108).

1. temperatureat reflux
2. temperatureThe reaction mixture was cooled in an ace bath
3. filtrationThe whole was filtered over Hyflo
4. customthe filtrate was evaporated
5. customThe residue was crystallized from acetonitrile