Enantioselective Synthesis of α-Allyl-α-aryldihydrocoumarins and 3-Isochromanones via Pd-Catalyzed Decarboxylative Asymmetric Allylic Alkylation
作者:Ramulu Akula、Patrick J. Guiry
DOI:10.1021/acs.orglett.6b02584
日期:2016.11.4
An enantioselective Pd-catalyzed DAAA of α-aryl-β-oxo esters has been developed employing the (R,R)-ANDEN-phenyl Trost ligand to prepare a series of α-aryl-α-allyldihydrocoumarins and 3-isochromanones. A variety of aryl groups were successfully employed to afford the dihydrocoumarin and 3-isochromanone products in high yields up to 95% and ee’s up to 96%. Under these conditions, substrates containing
利用(R,R)-ANDEN-苯基Trost配体,开发了对映选择性的Pd催化的α-芳基-β-氧代酯的DAAA,以制备一系列α-芳基-α-烯丙基二氢香豆素和3-异色酮。成功地使用了各种芳基,以高达95%的高收率和高达96%的ee收率提供了二氢香豆素和3-isochromanone产品。在这些条件下,含有二和单-邻取代的芳基的底物具有最高水平的对映选择性。这项工作代表了全碳四元α-烯丙基-α-芳基二氢香豆素和3-异色酮的对映选择性制备的第一个实例。