A synthetic approach based on a palladium-mediated vinylation of indole derivatives was established for the preparation of 5, a key intermediate in the synthesis of N-(tert-butoxycarbonyl)-l-1H-[(R)-1,1-dimethyl-2,3-epoxypropyl]-β-hydroxytryptophan ethyl ester (6). Unsatisfying yields were obtained using N-alkyl-3-haloderivatives. The best method proved to be the oxidative coupling on 3-unsubstituted indole derivative.
一种基于
钯介导的
吲哚衍
生物的
乙烯化合成方法被建立,以准备5,这是合成N-(叔丁氧羰基)-l-1H-[(R)-
1,1-二甲基-2,3-环氧丙基]-β-羟色
氨酸
乙酯(6)中的关键中间体。使用N-烷基-3-卤化衍
生物时所得产率不理想。最好的方法被证明是对3-未取代
吲哚衍
生物进行氧化偶联反应。