合成 de methyl-3,4aethyl-2 perhydrovinyl-5 furo [2,3-b] furannediol-3,4 a partir de la photocycloaddition du dimethyl-3,4 furanne et du benzyloxy-3 propanal
Stereoselective Synthesis of the Bis-tetrahydrofuran Fragment (C-1-C-9) of Asteltoxin
作者:Johann Mulzer、Joerg-Torsten Mohr
DOI:10.1021/jo00084a039
日期:1994.3
An 18-step synthesis of the chiral bis-tetrahydrofuran fragment 2 of asteltoxin 1 is described. This synthesis proceeds under practically complete substrate stereocontrol, starting with compound 5a. From there the chirality centers of 2 are generated with >95% ds each by using a sequence of Claisen rearrangement, chelate Cram Grignard addition, and osmylation reactions. The current synthesis affords 2 in racemic form. The key intermediate 8 was also synthesized with ee > 96%, which should provide access to 2 in both enantiomeric forms.