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.
Total Synthesis of Melicoptelines C–E: Antiviral Cyclopeptides Containing a Hexahydropyrrolo[2,3-<i>b</i>]indole Moiety
作者:Joonseok Jang、Jinwoo Lee、Seok Beom Lee、Seung Hyun Choi、Eun Jin Park、Sang Jun Yoon、Joon Soo An、Dong-Chan Oh、Won Keun Oh、Suckchang Hong
DOI:10.1021/acs.orglett.2c02339
日期:2022.8.19
3a-hydroxy hexahydropyrrolo[2,3-b]indole (HPI) moiety, exhibit anti-influenza activity. Herein, we report the first total synthesis of melicoptelines C–E (1–3, respectively). The core 3a-hydroxy HPIs were synthesized in a diastereoselective manner from l-tryptophan using dimethyldioxirane-mediated oxidation. Subsequently, sequential peptide couplings and cyclization completed the synthesis of melicoptelines