Organocatalyzed enantioselective synthesis of 2-amino-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carboxylates
作者:Naresh Ramireddy、Santhi Abbaraju、Cong-Gui Zhao
DOI:10.1016/j.tetlet.2011.10.040
日期:2011.12
The organocatalyzedenantioselectivesynthesis of biologically active 2-amino-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carboxylate derivatives was achieved using bifunctional cinchona alkaloids as the catalysts. Using quinine thiourea as the catalyst, the tandem Michael addition–cyclization reaction between 1,3-cyclohexanediones and alkylidenecyanoacetate derivatives gives the desired products in high
以双功能金鸡纳生物碱为催化剂,有机催化对映选择性合成具有生物活性的 2-amino-5-oxo-5,6,7,8-tetrahydro-4 H -chromene-3-carboxylate 衍生物。使用奎宁硫脲作为催化剂,1,3-环己二酮和亚烷基氰基乙酸酯衍生物之间的串联迈克尔加成环化反应以高产率(高达 92%)和良好的 ee 值(高达 82%)得到所需产物。