Diastereoselective Reductive Ring Expansion of Spiroketal Dihydropyranones to <i>cis</i>-Fused Bicyclic Ethers
作者:Liangyu Zhu、Liyan Song、Rongbiao Tong
DOI:10.1021/ol302813e
日期:2012.12.7
A novel double cascade synthetic strategy was developed for the diastereoselective syntheses of cis-fused bicyclicethers, featuring cascade Achmatowicz rearrangement/spiroketalization and cascade spiroketal reduction/oxa-Michael cyclization. Especially, the chemo-, regio-, and diastereoselective reduction of densely functionalized spiroketal dihydropyranones, followed by oxa-Michael cyclization in