Enantioselective Diels–Alder reactions of 1,3-cyclohexadiene with N-sulfinylbenzyl carbamate (1a) or N-sulfinyl-p-toluenesulfonamide (1b) promoted by chiral Ti(IV)-based Lewis acids are reported. The endo-adducts were obtained in 15–76% ee.
据报道
1,3-环己二烯与N-亚磺酰基苄基
氨基甲酸酯(1a)或N-亚磺酰基-p-
甲苯磺酰胺(1b)的对映选择性狄尔斯-阿尔德反应是由手性基于Ti(IV)的
路易斯酸促进的。该内以15-76%EE获得-adducts。