作者:Tse-Lok Ho、Chun-Kuei Chen
DOI:10.1002/hlca.200690027
日期:2006.2
A novel route to the racemic selenide (1RS,12bRS)-1-ethyl-2,3,6,7,12,12b-hexahydro-1-[2-(phenylseleno)ethyl]indolo[2,3-a]quinolizin-4(1H)-one (13b), a key intermediate in the total synthesis of vallesamidine (1), was elaborated. Compound 3a, obtained by Pictet–Spengler reaction of tryptamine and cyclohept-4-enyl-1-carbaldehyde (2c), was oxidized with KMnO4 to the diacid 4, which was subsequently converted
外消旋硒化物(1 RS,12b RS)-1-乙基-2,3,6,7,12,12b-六氢-1- [2-(苯基硒代)乙基]吲哚[2,3- a精心设计的喹诺嗪-4(1 H)-one(13b)是缬沙胺(1)的总合成中的关键中间体。通过类固醇胺和环庚-4-烯基-1-甲醛(2c)的Pictet-Spengler反应获得的化合物3a用KMnO 4氧化为二酸4,随后将其转化为同分异构的四环内酰胺5a,b。经过适当的保护演习,巴顿将10a,b脱羧,用PhSe 2 Ph捕集,并除去Boc,得到13b。