provides optically active 3,4-dihydroquinolin-2-ones in high yields with good enantioselectivities and diastereoselectivities. In this transformation, the chiral dipolar copper–allenylidene intermediates are kinetically generated via decarboxylative ethynyl benzoxazinanones, followed by the attack of the enolate azlactones to form enantiomerically enriched 3,4-dihydroquinolin-2-one structures.
本文开发了一种pybox-copper催化的
乙炔基苯并恶嗪酮酮与
丁二酮的对映选择性脱羧[4 + 2]环加成反应,可提供高产率的旋光3,4-二氢
喹啉-2-酮,具有良好的对映选择性和非对映选择性。在这种转化中,手性偶极
铜-亚烯基中间体是通过脱羧
乙炔基苯并恶嗪酮酮动力学生成的,然后烯醇盐a酸酯形成对映异构体富集的3,4-二氢
喹啉-2-酮结构。