Enantioselective Synthesis of the 3C-Protease Inhibitor (-)-Thysanone by a Staunton-Weinreb Annulation Strategy
作者:Margaret Brimble、Jonathan Sperry、Tsz Yuen
DOI:10.1055/s-0029-1217390
日期:2009.8
The total synthesis of (-)-thysanone is described. The key step involves the addition of an o-toluate anion to a lactone to create the naphthopyran framework (Staunton-Weinreb annulation). This synthesis further confirms the absolutestereochemistry of the natural product to be 1R,3S. thysanone - Staunton-Weinreb annulation - total synthesis - natural products - polycycles
The total syntheses of the pyranonaphthoquinone natural products dehydroherbarin, (+)-astropaquinone B and (+)-astropaquinone C are described. A late stage oxidation strategy employed for the synthesis of the astropaquinones was not amenable to the conversion of dehydroherbarin into the ascomycones. The syntheses of astropaquinones B and C reported herein constitute the first total syntheses and their absolute stereochemistry was determined to be (1R,3S).