Azabicycloalkanes as analgetics. II. An improved synthesis of 1-phenyl-6-azabicyclo(3,2,1)octane derivatives.
作者:MIKIO TAKEDA、HIROZUMI INOUE、KATSUYUKI NOGUCHI、YASUSHI HONMA、MASATOSHI KAWAMORI、GORO TSUKAMOTO、YASUHIKO YAMAWAKI、SEIICHI SAITO
DOI:10.1248/cpb.24.1514
日期:——
An improved synthesis of 6, 7endo-dimethyl-1-(3-hydroxyphenyl)-6-azabicyclo [3, 2, 1]-octane (10c), a new analgetic agent with a low addiction liability, is described. Grignard reaction of 3-ethoxy-2-cyclohexen-1-one (1) with m-methoxyphenylmagnesium bromide gave the α, β-unsaturated ketone (2b). Hydrocyanation of the latter followed by methanolysis yielded the keto ester (5b). The bicyclic lactam (8b), a key intermediate in the original synthesis was obtained by reductive amination of 5b with methylamine. As a result of this sequence of reactions, 10c could be obtained in 7 steps from 1 in 42% overall yield. By an application of this new method, a number of 1-phenyl-6-azabicyclo [3, 2, 1] octane derivatives with various substituents on benzene ring (10d-k), nitrogen (31), and C8 (39-46) have been prepared for pharmacological evaluation.
描述了一种改进的合成方法,用于合成6,7内源性二甲基-1-(3-羟基苯基)-6-氮杂双环[3,2,1]-八烷(10c),这是一种低成瘾性的新镇痛剂。3-乙氧基-2-环己烯-1-酮(1)与m-甲氧基苯基溴化镁的格里尼亚反应生成α,β-不饱和酮(2b)。随后对后者进行氰化反应,再经过甲醇解反应得到酮酯(5b)。通过5b与甲胺的还原胺化反应,得到原合成中的关键中间体双环内酰胺(8b)。通过这一系列反应,10c可从1起始物经过7步反应获得,整体产率为42%。应用这一新方法,合成了多种具有不同取代基的1-苯基-6-氮杂双环[3,2,1]八烷衍生物(10d-k)、氮化合物(31),以及C8取代物(39-46),以供药理评估。