Dienamine-Mediated Asymmetric Inverse-Electron-Demand Hetero-Diels-Alder Reaction of Linear Deconjugated Enones: Diversity-Oriented Synthesis of 3,4-Dihydropyrans
作者:Rajendra Maity、Subhas Chandra Pan
DOI:10.1002/ejoc.201601575
日期:2017.1.26
The dienamine‐mediated inverse‐electron‐demand hetero‐Diels–Alder reaction of deconjugated enones having α‐CH groups and electron‐deficient oxadienes with a cyano group allows the efficient and enantioselective synthesis of 2,4‐stereogenic 3,4‐dihydropyrans. With a primary amine and benzoic acid, high yields and excellent enantioselectivities are obtained for a range of 3,4‐dihydropyrans.
具有α-CH基团的共轭烯酮和具有氰基的缺电子二氧烯的二烯胺介导的逆电子需求异狄尔斯-阿尔德反应可实现2,4-立体异构3,4-二氢吡喃的高效和对映选择性合成。使用伯胺和苯甲酸,在3,4-二氢吡喃范围内可获得高收率和出色的对映选择性。