Atropisomeric enone-imides and enone-amides featuring N-CAryl bond rotation were evaluated for intramolecular [2 + 2] photocycloaddition. Straight addition product was observed over cross-addition product with good control over reactivity. The atropselectivity was found to be dependent on the substituent on the aryl ring. Substitution-dependent atropselectivity was rationalized on the basis of a divergent
对分子特征为[2 + 2]的光环加成反应,评估了具有N -C芳基键旋转特性的对映异构烯酮-
酰亚胺和烯酮-酰胺。观察到与交叉加成产物相比,直加成产物具有对反应性的良好控制。发现阻转选择性取决于芳基环上的取代基。在不同的机理途径的基础上合理化了取代相关的阻转选择性。