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。