Highly stereoselective synthesis of 2,3-dihydrofurans <i>via</i> a cascade Michael addition-alkylation process: a nitro group as the leaving group
作者:Yiran Mo、Siyang Liu、Yingying Liu、Ling Ye、Zhichuan Shi、Zhigang Zhao、Xuefeng Li
DOI:10.1039/c9cc01509d
日期:——
The Michael addition-alkylation process between gem-benzoyl-nitrostyrenes and 1,3-dicarbonyl compounds proceeded smoothly in the presence of a bifunctional squaramide, exclusively providing 2,3-dihydrofurans as trans-diastereomers in 33–92% isolated yields and excellent enantioselectivities (29–>99% ee).
宝石-苯甲酰基-硝基苯乙烯和1,3-二羰基化合物之间的迈克尔加成烷基化过程在双官能方酰胺存在下顺利进行,仅提供2,3-二氢呋喃为反式-非对映异构体,分离产率为33-92%,对映选择性优异(29%-> 99%ee)。