Volume 57, Issue 46 pp. 15209-15212
Communication

Total Syntheses of Bisdehydroneostemoninine and Bisdehydrostemoninine by Catalytic Carbonylative Spirolactonization

Dr. Kaiqing Ma

Dr. Kaiqing Ma

Department of Chemistry, Center for Cancer Research, and Institute for Drug Discovery, Purdue University, West Lafayette, Indiana, 47907 USA

Modern Research Center for Traditional Chinese Medicine, of Shanxi University, Taiyuan, 03006 Shanxi, China

These authors contributed equally to this work.

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Xianglin Yin

Xianglin Yin

Department of Chemistry, Center for Cancer Research, and Institute for Drug Discovery, Purdue University, West Lafayette, Indiana, 47907 USA

These authors contributed equally to this work.

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Prof. Mingji Dai

Corresponding Author

Prof. Mingji Dai

Department of Chemistry, Center for Cancer Research, and Institute for Drug Discovery, Purdue University, West Lafayette, Indiana, 47907 USA

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First published: 19 September 2018
Citations: 73

Graphical Abstract

Core strength: The first total syntheses of the stemona alkaloids bisdehydroneostemoninine and bisdehydrostemoninine are reported. The synthesis features a novel palladium-catalyzed carbonylative spirolactonization to rapidly construct the oxaspirolactone moiety and a Lewis acid promoted tandem Friedel–Crafts cyclization and lactonization to form the 5-7-5 tricyclic core of the target alkaloids.

Abstract

The first total syntheses of the stemona alkaloids bisdehydroneostemoninine and bisdehydrostemoninine in racemic forms have been achieved. The synthetic strategy features a novel palladium-catalyzed carbonylative spirolactonization of a hydroxycyclopropanol to rapidly construct the oxaspirolactone moiety. It also features a Lewis acid promoted tandem Friedel–Crafts cyclization and lactonization to form the 5-7-5 tricyclic core of the target stemona alkaloids.

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