(E)1-acetyl-[2-(3-methyl-2-butenyloxy)benzylidene]indolin-2-one (1) gives competition between the intramolecular Hetero Diels-Alder (HDA) (thermal conditions) and the intramolecular ene reaction (IER) (magnesium perchlorate - MP - catalyzed conditions). Several complexes derived from MP and chiral bis-oxazolines were found to be excellent chemo- and enantioselective catalysts with a different degree
(E)1-乙酰基-[2-(3-甲基-
2-丁烯氧基)亚苄基]
吲哚-2-酮(1)在分子内杂狄尔斯-阿尔德(H
DA)(热条件)和分子内烯反应之间产生竞争(IER)(
高氯酸镁-MP-催化条件)。发现衍生自MP和手性双-
恶唑啉的几种配合物是优异的
化学和对映选择性催化剂,其选择性程度取决于
恶唑啉环上的取代基。最
化学选择性oxazolinic
配体迫使反应,得到[H
DA]之比:[IER]产品5:95.反式- (4,5-二苯基
恶唑啉) - MP复合物是最好的对映选择性和催化剂的IER的产物1可以75%的收率和88%的ee制备。