Facile synthesis of spiro chromanone-tetrahydrothiophenes with three contiguous stereocenters via sulfa-Michael/aldol cascade reactions
作者:Ya-Jian Hu、Xiao-Bing Wang、Su-Yi Li、Sai-Sai Xie、Kelvin D.G. Wang、Ling-Yi Kong
DOI:10.1016/j.tetlet.2014.11.026
日期:2015.1
A novel sulfa-Michael/aldol cascade reaction of (E)-3-arylidenechroman-4-ones with 1,4-dithiane-2,5-diol has been developed. This method provides a new practical and facile approach to 4′-hydroxy-2′-aryl-4′,5′-dihydro-2′H-spiro[chroman-3,3′-thiophen]-4-ones with three contiguous stereocenters in high yields. The transformation is atom-economic with good to excellent diastereoselectivities.
(E)-3-芳基苯并二氢吡喃-4-酮与1,4-二噻吩-2,5-二醇的新型磺胺-迈克尔/羟醛级联反应已得到开发。此方法提供了一种新的实用的和容易的方法来4'-羟基-2'-芳基-4',5'-二氢-2' ħ -螺[色满-3,3'-噻吩] -4-酮用三个连续高产量的立体中心。该转化是原子经济的,具有良好的至优异的非对映选择性。