Liu, Qiang Asymmetric Synthesis of Spiro-oxindole-ε-lactones through N-Heterocyclic Carbene Catalysis. [electronic resource] - Organic letters 06 2018 - 3622-3626 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1523-7052 Standard No.: 10.1021/acs.orglett.8b01400 doi