Organocatalytic Enantioselective [1 + 4] Annulation of Morita–Baylis–Hillman Carbonates with Electron-Deficient Olefins: Access to Chiral 2,3-Dihydrofuran Derivatives
作者:Yuyu Cheng、Yuzhe Han、Pengfei Li
DOI:10.1021/acs.orglett.7b02144
日期:2017.9.15
electron-deficient olefins via a Michael alkylation process. Morita–Baylis–Hillman carbonates reacted smoothly with β,γ-unsaturated α-keto ester and α,β-unsaturated ketone substrates under 1,2-bis[(2R,5R)-2,5-dimethylphospholano]benzene monoxide catalysis to furnish a wide range of optically active 2,3-dihydrofurans in high yields (up to 95%) with excellent asymmetric induction (up to >99% ee, >20:1
已经开发了一种反应,通过迈克尔烷基化过程,利用手性膦催化的Morita–Baylis–Hillman碳酸盐与手性膦[1 + 4]与碳原子数不足的环化反应。在1,2-双[(2 R,5 R)-2,5-二甲基膦基]一氧化苯催化下,Morita–Baylis–Hillman碳酸盐与β,γ-不饱和α-酮酸酯和α,β-不饱和酮底物平稳反应以高收率(高达95%)提供各种光学活性的2,3-二氢呋喃,并具有出色的不对称诱导(高达> 99%ee,> 20:1 dr)。该协议代表了通过不对称迈克尔烷基化多米诺反应合成旋光多功能2,3-二氢呋喃的有效策略。