Li Wu, Yin Zheng, Yunchuang Wang
Jan 26, 2016
Citations
0
Influential Citations
11
Citations
Journal
RSC Advances
Abstract
An enantioselective formal [3 + 3] annulation of 1-methylindoline-2-thiones and 4-arylmethylideneoxazolin-5(4H)-ones has been developed by the use of an L-tert-leucine-derived bifunctional tertiary amine-squaramide catalyst, which furnished a series of optically active conformationally strained β-branched cyclic tryptophan derivatives in acceptable yields with good to excellent diastereo- and enantioselectivities.