Copper-Catalyzed Radical Cyclization To Access 3-Hydroxypyrroloindoline: Biomimetic Synthesis of Protubonine A
摘要:
An unprecedented copper-catalyzed intramolecular radical cyclization was developed for the synthesis of 3-hydroxypyrroloindoline skeletons in excellent yields. The 3-hydroxyl group was introduced by trapping the radical intermediate with molecular oxygen or TEMPO. This process represents a unique radical oxidation pathway for tryptamine/tryptophan derivatives and allows a rapid biomimetic synthesis of natural product protubonine A.
An environmentally friendly protocol for oxidative halocyclization of tryptamine and tryptophol derivatives
作者:Jun Xu、Rongbiao Tong
DOI:10.1039/c7gc01341h
日期:——
environmentally friendly and efficient protocol (KX/oxone) for oxidative halocyclization of tryptamine/tryptophol derivatives was developed and demonstrated with 28 examples and concisetotalsynthesis of cyclotryptamine alkaloid protubonines A and B. The distinct advantage of this protocol over all previous methods is that no organic byproduct is generated from a halogenating agent or oxidant, thus greatly reducing
Total Synthesis and Structural Revision of (-)-Protubonine A and (-)-Protubonine B
作者:Paula Lorenzo、Rosana Álvarez、Ángel R. de Lera
DOI:10.1002/ejoc.201400029
日期:2014.4
The proposed structures of (–)-protubonine A and (–)-protubonine B, which are pyrrolidinoindoline diketopiperazine alkaloids that were isolated from the marine-derived fungus Aspergillus sp. SF-5044, have been synthesized and correspond to diastereomers of the natural isolates. The total syntheses, herein, established the stereostructures of the alkaloids as the C-11 epimers of the purported structures
(-)-protubonine A 和 (-)-protubonine B 的拟议结构,它们是从海洋来源的真菌 Aspergillus sp. 中分离的吡咯烷并吲哚啉二酮哌嗪生物碱。SF-5044 已合成,对应于天然分离物的非对映异构体。本文中的全合成将生物碱的立体结构确定为所声称结构的 C-11 差向异构体。