An expedient access to optically active spiro-[butyrolactone-pyrrolidine] was successfully developed via an unprecedented Cu(I)-catalyzed exo-selective 1,3-DC of azomethine ylides with α-methylene-γ-butyrolactone, which exhibited high diastereoselectivity (>98â:â2), excellent enantioselectivity (96â>99% ee) and a broad substrate scope under mild conditions.
成功开发了一种便捷的方法,通过前所未有的
铜(I)催化下的外选择性1,3-双环加成反应,使得光学活性的螺环-[丁内酯-
吡咯烷]得以合成。该反应与α-亚甲基-
γ-丁内酯反应,展现出高的非对映选择性(>98â:â2)、优异的对映体选择性(96â>99% ee)以及在温和条件下的广泛底物适用性。