作者:Richard P Hsung、Kevin P Cole、Luke R Zehnder、Jiashi Wang、Lin-Li Wei、Xiao-Fang Yang、Heather A Coverdale
DOI:10.1016/s0040-4020(02)01524-7
日期:2003.1
A 20-step total synthesis of (±)-arisugacin A with an overall yield of 2.1% is described here in detail. This synthesis features a formal [3+3] cycloaddition reaction of α,β-unsaturated iminium salts with 6-aryl-4-hydroxy-2-pyrones through a highly stereoselective 6π-electron electrocyclic ring-closure of 1-oxatriene. A strategic dihydroxylation–deoxygenation protocol leading to the desired angular
The first convergent totalsynthesis of (+/-)-arisugacin A was accomplished by stereoselective construction of the arisugacin skeleton via a Knoevenagel-type reaction of an alpha,beta-unsaturated aldehyde with a 4-hydroxy 2-pyrone and stereoselective dihydroxylation followed by deoxygenation.