| Literature DB >> 30230670 |
Kaiqing Ma1,2, Xianglin Yin1, Mingji Dai1.
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.Entities:
Keywords: alkaloids; cyclizations; natural products; palladium; total synthesis
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Year: 2018 PMID: 30230670 PMCID: PMC6459687 DOI: 10.1002/anie.201809114
Source DB: PubMed Journal: Angew Chem Int Ed Engl ISSN: 1433-7851 Impact factor: 15.336