Lewis Base Assisted Brønsted Base Catalysis: Direct Asymmetric Allylic Alkylation of Indenes
作者:Hai-Lei Cui、Xun-Hao Sun、Lin Jiang、Lin Dong、Ying-Chun Chen
DOI:10.1002/ejoc.201101255
日期:2011.12
A direct, asymmetric allylic alkylation of indenes withMorita–Baylis–Hillman (MBH) carbonates has been developed based on a Lewis base assisted Bronsted base catalysis strategy. This process is promoted by a modified cinchona alkaloid hydroquinidine (anthraquinone-1,4-diyl) diether [(DHQD)2AQN] and gives rise to multifunctional chiral indene derivatives with moderate to excellent enantioselectivities
基于路易斯碱辅助布朗斯台德碱催化策略,已经开发出与 Morita-Baylis-Hillman (MBH) 碳酸酯直接、不对称烯丙基烷基化茚。该过程由改性金鸡纳生物碱氢奎尼丁(蒽醌-1,4-二基)二醚 [(DHQD) 2AQN] 促进,并产生具有中等至优异对映选择性 (53-95% ee) 的多功能手性茚衍生物,尽管在低到适度的收益率 (27-71%)。