Approach to Tetrodotoxin via the Oxidative Amidation of a Phenol
摘要:
An approach to tetrodotoxin that relies on the oxidative amidation of methyl 4-hydroxyphenylacetate as a key step is described. The stereoselective Introduction of a beta-hydroxynitrile functionality on one of the double bonds of the emerging dienone is achieved through an intramolecular nitrile oxide cycloaddition-fragmentation sequence.
Assembly of a Key Dienic Intermediate for Tetrodotoxin via a Machetti–DeSarlo Reaction
作者:Jaclyn Chau、Sanjia Xu、Marco A. Ciufolini
DOI:10.1021/jo401960p
日期:2013.12.6
racemic diene intermediate for the synthesis of tetrodotoxin is described. Key steps of the sequence leading to such a compound include the oxidative amidation of a phenol, a Cu(II)-catalyzed cyclocondensation of a nitroketone with an olefin (Machetti–DeSarlo reaction), and a nucleophilic fragmentation of the resulting isoxazoline. Several unusual reactions encountered in the course of this study are