A Concise Synthesis of Castanospermine by the Use of a Transannular Cyclization
作者:Thomas Jensen、Mette Mikkelsen、Anne Lauritsen、Thomas L. Andresen、Charlotte H. Gotfredsen、Robert Madsen
DOI:10.1021/jo9019495
日期:2009.11.20
A nine-step synthesis of (+)-castanospermine has been accomplished in 22% overall yield from methyl α-d-glucopyranoside. The key transformations involve a zinc-mediated fragmentation of benzyl-protected methyl 6-iodoglucopyranoside, ring-closing olefin metathesis, and strain-release transannularcyclization to afford the indolizidine skeleton of the natural product.