Concise, enantioselective total syntheses of both the proposed and revised structures of (−)-versiquinazoline H
作者:Jiang-Feng Wu、Pei-Qiang Huang
DOI:10.1016/j.cclet.2019.06.043
日期:2020.1
Abstract The enantioselective totalsynthesis of the putative structure of versiquinazoline H and three diastereomers has been achieved, which allowed the revision of the stereochemistry of this natural product. This six-step totalsynthesis relied on the evolution of the strategy that we previously developed, which features a DMDO-triggered tandem reaction. The modification of the lactamization step
The total synthesis of the alkaloid (â)-chaetominine (1) has been achieved in four steps with an overall yield of 33.4%. Key features of our strategy include a one-pot cascade indole epoxidation â epoxide ring-opening cyclization â lactamization reaction sequence, and the use of a nitro group as a latent amino group for the one-pot construction of the quinazolinone ring. This constitutes a step economical, redox economical and protecting group-free total synthesis.