Derivatives of 2-chloro-6-(4-hydroxy-1-methylpiperidin-4-yl)pyridine (2b) were prepared and tested as analgesics. 2-Chloro-6-lithiopyridine treated with quinuclidin-3-one, 1-methylpyrrolidin-3-one, 2-(dimethylaminomethyl)cyclohexanone, and ethyl 1-methylpiperidin-4-ylcarboxylate provided the corresponding alcohols 5, 6, 13a, and 6-chloro-2-pyridyl 1-methylpiperidin-4-yl ketone (9). The ketone was reduced with sodium borohydride or treated with methylmagnesium chloride or phenyllithium to provide the corresponding alcohols 11, 12a and 12b, respectively. 1-[4-(6-Chloro-2-pyridyl)1-methylpiperidin-4-yl]-1-methylethanol (4b) was prepared from 2-chloro-6-(1-methyl-1,2,5,6-tetrahydropyridin-4-yl)pyridine (14b) by treatment with butyllithium and acetone followed by reduction of intermediate 15b with sodium cyanoborohydride.
2-氯-6-(4-羟基-1-甲基哌啶-4-基)吡啶的衍生物(2b)被制备并作为镇痛剂进行了测试。用三氢吡啶-3-酮、1-甲基吡咯烷-3-酮、2-(二甲氨基甲基)环己酮和乙酸乙酯1-甲基哌啶-4-基羧酸酯处理2-氯-6-锂吡啶,得到相应的醇5、6、13a和6-氯-2-吡啶基-1-甲基哌啶-4-基酮(9)。酮经硼氢化钠还原或用甲基镁氯化物或苯基锂处理,得到相应的醇11、12a和12b。1-[4-(6-氯-2-吡啶基)-1-甲基哌啶-4-基]-1-甲乙醇(4b)通过用丁基锂和丙酮处理2-氯-6-(1-甲基-1,2,5,6-四氢吡啶-4-基)吡啶(14b)制备,随后用氰硼氢钠还原中间体15b得到。