AbstractA highly efficient and enantioselective inverse electron‐demand hetero‐Diels–Alder reaction of in situ generated 1,2‐diaza‐1,3‐dienes with enol ethers has been developed with the use of a chiral copper/bisoxazoline complex as the catalyst. The reaction exhibits high enantioselectivity (up to 90% ee) and provides a robust and powerful method to synthesize a variety of structurally diverse and densely substituted chiral pyridazine derivatives in good to excellent yields.magnified image
Catalytic Asymmetric Synthesis of [2,3]-Fused Indoline Heterocycles through Inverse-Electron-Demand Aza-Diels-Alder Reaction of Indoles with Azoalkenes
作者:Min-Chao Tong、Xuan Chen、Jun Li、Rong Huang、Haiyan Tao、Chun-Jiang Wang
DOI:10.1002/anie.201400109
日期:2014.4.25
An unprecedented catalytic asymmetric inverse‐electron‐demand aza‐Diels–Alderreaction of indoles with in situ formed azoalkenes is reported. A diverse set of [2,3]‐fused indoline heterocycles were achieved in generally good yields (up to 97 %) with high regioselectivity and diastereoselectivity (>20:1 d.r.), and with excellent enantioselectivity (up to 99 % ee).