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 bicyclic ethers, 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
为顺式稠合的双环醚的非对映选择性合成,开发了一种新颖的双级联合成策略,其特征在于级联的Achmatowicz重排/螺环缩合和级联的螺环缩合/ oxa-Michael环化。特别是,实现了化学,区域和非对映选择性还原的高密度官能化螺酮二氢吡喃酮,然后以一锅方式进行氧杂-迈克尔环化。