A regioselective facile synthesis of furo[3,4-b]carbazolones: application to the total synthesis of mafaicheenamine E and claulansine D
作者:Dipakranjan Mal、Joyeeta Roy
DOI:10.1039/c5ob00575b
日期:——
reductive cyclization to furo[3,4-b]carbazolones on reaction with LiAlH4. One of the furocarbazolones is utilized to accomplish the first total synthesis of claulansine D and mafaicheenamine E in 9 and 6 steps respectively. The other key steps of the syntheses are addition of an allylic indium reagent and CC double bond isomerization.
1-羟基咔唑-2,3-二羧酸酯已显示出在与LiAlH 4反应时发生化学选择性还原环化反应生成呋喃并[3,4- b ]咔唑酮。利用呋喃咔唑酮中的一种来分别完成9个步骤和6个步骤的克劳兰新D和马法拉敏E的首次全合成。合成的其他关键步骤是添加烯丙基铟试剂和CC双键异构化。