作者:Daniel Solé、Josep Bonjoch、Silvina García-Rubio、Emma Peidró、Joan Bosch
DOI:10.1002/(sici)1521-3765(20000218)6:4<655::aid-chem655>3.0.co;2-6
日期:2000.2.18
A total synthesis of (-)-strychnine in 15 steps from 1,3-cyclohexanedione in 0.15% overall yield is described. The sequence followed in the assembling of rings is: E-->AE [2-(2-nitrophenyl)-1,3-cyclohexanedione]-->ACE (3a-aryloctahydroindol-4-one)-->ACDE (arylazatricyclic core)-->ABCDE (strychnan skeleton)-->ABCDEF (Wieland-Gumlich aldehyde)-->ABCDEFG (strychnine). The key steps of the synthesis are
描述了由1,3-环己二酮以0.15%的总收率分15步合成(-)-士的宁。组装环后的顺序是:E-> AE [2-(2-硝基苯基)-1,3-环己二酮]-> ACE(3a-芳基氢化吲哚-4-酮)-> ACDE(芳基三环核心) )-> ABCDE(Strychnan骨架)-> ABCDEF(Wieland-Gumlich醛)-> ABCDEFG(Strychnine)。合成的关键步骤是3a-(2-硝基苯基)-八氢吲哚-4-酮环系统的对映选择性结构,以及通过还原性Heck环化反应生成关键中间体(-)-14闭合哌啶环。相反,路易斯酸促进的α-烷氧基炔丙基硅烷-烯酮环化没有导致合成上有用的氮杂三环ACDE中间体。