exo-Selective construction of spiro-[butyrolactone-pyrrolidine] via 1,3-dipolar cycloaddition of azomethine ylides with α-methylene-γ-butyrolactone catalyzed by Cu(i)/DTBM-BIPHEP
exo-Selective construction of spiro-[butyrolactone-pyrrolidine] via 1,3-dipolar cycloaddition of azomethine ylides with α-methylene-γ-butyrolactone catalyzed by Cu(i)/DTBM-BIPHEP
作者:Qing-Hua Li、Tang-Lin Liu、Liang Wei、Xiang Zhou、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c3cc45493b
日期:——
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.