An enantioselective intramolecular heterocyclization with in situ generated 3-hydroxyisoindolinone-derived N-acyliminium ions has been successfully accomplished. In the presence of a catalytic amount of a chiral phosphoric acid, functionalized 3,3-disubstituted isoindolinones bearing N-acyl-N,O-acetal moieties were obtained with good yields and a high level of stereocontrol (up to 98:2 er). This efficient
用原位产生的 3-羟基
异吲哚啉酮衍生的N-酰基
亚胺离子实现了对映选择性分子内杂环化。在催化量的手性
磷酸存在下,以良好的收率和高
水平的立体控制(高达 98:2 er)获得了带有N-酰基-N、O-
缩醛部分的官能化 3,3-二取代
异吲哚啉酮. 这种有效的方法在温和的条件下进行,并且对于 3-羟基
异吲哚啉酮和羟基伙伴都表现出广泛的范围。