A Tunable and Enantioselective Hetero-Diels-Alder Reaction Provides Access to Distinct Piperidinoyl Spirooxindoles
作者:Samydurai Jayakumar、Kathrin Louven、Carsten Strohmann、Kamal Kumar
DOI:10.1002/anie.201708355
日期:2017.12.11
The active complexes of chiral N,N′‐dioxide ligands with dysprosium and magnesium salts catalyze the hetero‐Diels–Alder reaction between 2‐aza‐3‐silyloxy‐butadienes and alkylidene oxindoles to selectively form 3,3′‐ and 3,4′‐piperidinoyl spirooxindoles, respectively, in very high yields and with excellent enantioselectivities. The exo‐selective asymmetric cycloaddition successfully regaled the construction
手性N,N'-二氧化物配体与和镁盐的活性络合物催化2-氮杂-3-甲硅烷基氧基丁二烯与亚烷基氧吲哚之间的杂狄尔斯-阿尔德反应,选择性地形成3,3'-和3,4分别以非常高的收率和极好的对映选择性来合成'-哌啶子基螺硫辛多酯。所述外切-选择性环加成不对称成功款待SP的结构3富和高度取代的基于天然产物spirooxindoles支撑许多手性中心,包括连续的全碳季中心。