Synthesis of 2,3,4-Trisubstituted Thiochromanes using an Organocatalytic Enantioselective Tandem Michael-Henry Reaction
作者:Rajasekhar Dodda、Joshua J. Goldman、Tanmay Mandal、Cong-Gui Zhao、Grant A. Broker、Edward R. T. Tiekink
DOI:10.1002/adsc.200700331
日期:2008.3.7
Enantioenriched 2,3,4-trisubstituted thiochromanes have been synthesized by using a cupreine-catalyzed tandem Michael addition-Henry reaction between 2-mercaptobenzaldehydes and beta-nitrostyrenes. Good diastereoselectivities and enantioselectivities were obtained for the title compounds, which may be further improved through a single recrystallization (up to 98% de and> 99% ee).
通过使用 2-巯基苯甲醛和 β-硝基苯乙烯之间的铜催化串联迈克尔加成-亨利反应合成了对映体富集的 2,3,4-三取代硫代苯并二氢吡喃。标题化合物获得了良好的非对映选择性和对映选择性,可以通过单次重结晶进一步改进(高达 98% de 和 > 99% ee)。