反应详情

As depicted in Scheme 5, Intermediate (M), for example, 5-(4-methylphenyl)-1,2,3,4-tetraazole, was prepared by reacting an appropriate toluonitrile, for example para-toluonitrile, with sodium azide at elevated temperature in an appropriate solvent. Intermediate (M) was then alkylated with an appropriate iodoalkane under basic conditions, affording the corresponding alkylated tetraazole (N), for example, 2-ethyl-5-(4methylphenyl)-1,2,3,4-tetraazole. Intermediate (N) was in turn brominated with, for example, N-bromosuccinimide at elevated temperature in an appropriate solvent, providing the corresponding bromomethyl derivative (O), for example, 5-[4-(bromomethyl)phenyl]-2-ethyl-1,2,3,4-tetraazole. Intermediate (O) was then reacted with ethyl isonipecotate under basic conditions in an appropriate solvent, providing the corresponding ester (P), for example, ethyl 1-{[4-(2-ethyl-1,2,3,4-tetraazol-5-yl)phenyl]methyl}piperidine-4-carboxylate, which was in turn converted to its piperidinecarboxylic acid (Q) by reacting it with aqueous sodium hydroxide in an appropriate solvent, affording, for example, 1-{[4-(2-ethyl-1,2,3,4-tetraazol-5-yl)phenyl]methyl}piperidinecarboxylic acid. Intermediate (Q) was then reacted with, for example, N,O-dimethylhydroxylamine hydrochloride and diethylcyanophosphonate, under basic conditions at reduced temperature in an appropriate solvent, yielding the corresponding piperidine carboxamine (R), for example, 1-{[4-(2-ethyl(1,2,3,4-tetraazol-5-yl))phenyl]methyl}(4-piperidyl)-N-methoxy-N-methylcarboxamide. Intermediate (R) was reacted with a Grignard Reagent, for example, 4-trifluoromethoxyphenylmagnesium bromide, in an appropriate solvent, affording the corresponding ketone (S), for example, 1-{[4-(2-ethyl(1,2,3,4-tetraazol-5-yl))phenyl]methyl}(4-piperidyl)4-(trifluoromethoxy)-phenyl ketone. The ketone (S) is then halogenated with, for example, phosphorous oxychloride in an appropriate solvent, yielding the corresponding halogen compound (S1), for example, {4-[chloro(1-{[4-(2-ethyl(1,2,3,4-tetraazol-5-yl))phenyl]methyl}(4-piperidyl))methyl]phenoxy}trifluoromethane. Intermediate (S1) is in turn reacted with, for example, an appropriate phenol, such as 4-(trifluoromethoxy)phenol in an appropriate solvent, providing the corresponding phenoxy derivative, a compound of formula I, for example, 1-[(1-[[4-(2-ethyl(1,2,3,4-tetraazol-5-yl))phenyl]methyl}(4-piperidylidene))[4-(trifluoromethoxy)phenyl]methoxy]-4-(trifluoromethoxy)benzene. Example 11, set forth below provides a detailed procedure for this synthesis.