unprecedented and strong positive nonlinear effect (NLE) was observed in Cu/DiPPAM-catalyzed asymmetric 1,6-conjugate addition of Et2Zn on (E)-3-(prop-1-en-1-yl)cyclohex-2-enone (71% ee reached with a 40% ee ligand). Moreover, similar behaviors were observed in Cu/DiPPAM-catalyzed 1,4-asymmetric conjugate additions of Et2Zn on both cyclohexenone and (E)-3-non-3-en-2-one (83% and 70% ee, respectively, reached
在(E)-3-(prop-1-en-1-yl)cyclohex-2上Cu / Di
PPAM催化的Et 2 Zn不对称1,6-共轭加成中观察到了前所未有的强正非线性效应(NLE)。-烯酮(71%ee达到40%ee
配体)。此外,在
环己烯酮和(E)-3-non-3-en-2-one上,Cu / Di
PPAM催化的Et 2 Zn的1,4-不对称共轭加成物Et 2 Zn观察到类似的行为(83%和70%ee,分别达到40%ee
配体)。