Liu, Honglei Metal-catalyzed [6 + 3] cycloaddition of tropone with azomethine ylides: a practical access to piperidine-fused bicyclic heterocycles. [electronic resource] - Journal of the American Chemical Society Feb 2014 - 2625-9 p. digital Publication Type: Journal Article ISSN: 1520-5126 Standard No.: 10.1021/ja4122268 doi