A convenient and high yielding method for the cleavage and scavenging of p-methoxybenzyl protecting group of several alcohols using tert-butyl bromide in refluxing acetonitrile is described. Under these mild conditions other protecting groups such as acid sensitive allyl, benzyl, and Me3CPh2Si ethers, or isopropylidene acetals were unchanged. Interestingly, a selective alkoxy-PMB cleavage was observed
Chemo-enzymatic asymmetric total synthesis of stagonolide-C
作者:Nandan Jana、Tridib Mahapatra、Samik Nanda
DOI:10.1016/j.tetasy.2009.10.007
日期:2009.11
The naturally occurring phytotoxic noneolide stagonolide-C has been synthesized by a chemo-enzymatic approach. Two key intermediates have been synthesized by applying a metal-enzyme combined DKR (dynamic kinetic resolution) strategy, followed by RCM (ring-closing metathesis) to afford the target compound in an efficient way. (C) 2009 Elsevier Ltd. All rights reserved.