Organocatalytic Michael–Knoevenagel–Hetero-Diels–Alder Reactions: An Efficient Asymmetric One-Pot Strategy to Isochromene Pyrimidinedione Derivatives
作者:Bor-Cherng Hong、Nitin S. Dange、Chun-Feng Ding、Ju-Hsiou Liao
DOI:10.1021/ol202877m
日期:2012.1.20
Synthesis of isochromene pyrimidinedione derivatives having five stereocenters has been achieved by a one-pot Michael–Knoevenagel condensation–inverse-electron-demand hetero-Diels–Alder reaction of α, β-unsaturated aldehydes, olefinic nitroalkanes, and 1,3-dimethylbarbituric acid via a one-potstrategy with excellent diastereo- and enantioselectivities (up to 99% ee). The structures and absolute configurations