New routes to clavine-type ergot alkaloids. Part 2: Synthesis of the last, so far not yet synthesized member of the clavine alkaloid family, (±)-cycloclavine
作者:Mária Incze、Gábor Dörnyei、István Moldvai、Eszter Temesvári-Major、Orsolya Egyed、Csaba Szántay
DOI:10.1016/j.tet.2008.01.101
日期:2008.3
Starting from 4-bromo-Uhle's ketone (2), an alkylation step using ethyl 3-methylamino-propionate followed by intramolecular aldol condensation in two steps, transformation of the ester group into a methyl group, and finally cyclopropanation of the 8,9 double bond, resulted in a six-step total synthesis of (±)-cycloclavine (1).
从4-溴乌尔酮(2)开始,使用3-甲基氨基丙酸乙酯进行烷基化步骤,然后分两步进行分子内醇醛缩合,将酯基转化为甲基,最后对8,9双分子进行环丙烷化键,导致六步全合成(±)-环锁骨链(1)。