Elektrophile und nucleophile Substitution partiell hydrierter Nicotinsäure-Derivate. 11. Mitt. über synthetische Indol-Verbindungen
作者:F. Troxler
DOI:10.1002/hlca.19730560130
日期:1973.1.31
gramines to the corresponding 1-methyl-5-skatyl-1,4-dihydronicotinamides (3), the structures of which have been proved by conversion of 6, a homologue of 3, into dimethyl pyridine-3,5-dicarboxylate (11). Palladium/H1 reduces 3 to the 1,4,5,6-tetrahydronicotinamides 12, which are hydrogenated with platinum/H1 to a mixture of the diastereomeric 1-methyl-5-skatyl-nipecotinamides 14 and 15. Alkaline hydrolysis
1-甲基-1,4-二氢烟酰胺(1)2与禾胺反应成相应的1-甲基-5-二十烷基-1,4-二氢烟酰胺(3),其结构已通过转化6(同系物)进行了证明的3,为二吡啶-3,5-二羧酸酯(11)。钯/ H 1将3还原为1,4,5,6-四氢烟酰胺12,将其与铂/ H 1氢化为非对映异构体1-甲基-5-十八烷基-哌啶子酰胺14和15的混合物。碱性水解转化为反酰胺15到顺式羧酸16。用苄基溴将1进行烯胺烷基化并随后进行催化还原,导致低产率生成5-苄基-1-甲基1,4,5,6-四氢烟酰胺(18)。通过强亲电卤化物将1-取代的1,4,5,6-四氢烟酸衍生物19烷基化为亚胺盐20,其在催化还原后通常以高收率形成3,3-二取代的哌啶21。讨论了影响烯胺烷基化的因素。已经研究了向亚胺盐20中添加亲核试剂。因此,1-甲基-六氢-2 H-吡咯[3.4- b]吡啶32和33是由治疗的制备20用氰化物,随后用还原的LiAlH