Total Synthesis of Carbazole Alkaloids - Ekeberginine, Harmandianamine A, and Furanoclausamine B
作者:Joyeeta Roy、Dipakranjan Mal
DOI:10.1002/ejoc.201301652
日期:2014.3
with dimethyl maleate provides an expedient route for the synthesis of the title carbazole alkaloids. The employment of this strategy in combination with a Krapcho reaction/retro-Kolbe–Schmitt reaction has culminated in the first total synthesis of the lactonic carbazoles harmandianamine A and furanoclausamine B and a brief total synthesis of ekeberginine from a prenylated furoindolone. An unusual
3-取代呋喃吲哚酮与马来酸二甲酯的阴离子 [4 + 2] 环化为合成标题咔唑生物碱提供了便利的途径。该策略与 Krapcho 反应/逆 Kolbe-Schmitt 反应结合使用,最终实现了内酯咔唑哈曼二胺 A 和呋喃克劳胺 B 的首次全合成,以及异戊二烯化呋喃吲哚酮对 ekeberginine 的短暂全合成。还报告了在环化过程中酯功能的异常断裂。