反应详情

To a stirred mixture of 34.64 parts of ethyl 4-hydroxy-1-piperidinecarboxylate and 940 parts of N,N-dimethylformamide were added portionwise 10 parts of a sodium hydride dispersion 50% at room temperature under nitrogen atmosphere. Upon complete addition, stirring was continued for 1 hour at room temperature. A solution of 45 parts of 2-chloro-1-(2-ethoxyethyl)-1H-benzimidazole in N,N-dimethylformamide was added dropwise at 50° C. Upon completion, the whole was stirred overnight at 50° C. The reaction mixture was poured into ice water and the product was extracted with trichloromethane. The extract was dried, filtered and evaporated, yielding 50 parts (69.1%) of ethyl 4-[[1-(2-ethoxyethyl)-1H-benzimidazol-2-yl]oxy]-1-piperidinecarboxylate as a residue (compound 19).

1. additionUpon complete addition
2. stirringUpon completion, the whole was stirred overnight at 50° C
3. extractionthe product was extracted with trichloromethane
4. customThe extract was dried
5. filtrationfiltered
6. customevaporated