Total syntheses of (±)-gephyrotoxin and (±)-perhydrogephyrotoxin

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Abstract

This article describes the full details of our total syntheses of gephyrotoxin and perhydrogephyrotoxin. Our central strategy toward the total synthesis is based on the use of an N-methoxy group as a reactivity control element. The N-methoxyamide group enabled unique transformations, involving i) the direct coupling reaction of the N-methoxyamide with an aldehyde, and ii) the amide-selective reductive allylation. These reactions were never accomplished without the assistance of the N-methoxy group. The amide-selective reductive allylation of the N-methoxyamide was especially practical, and excluded a number of extra steps including protecting group manipulations and redox reactions in the total syntheses.

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Shirokane, K., Tanaka, Y., Yoritate, M., Takayama, N., Sato, T., & Chida, N. (2015). Total syntheses of (±)-gephyrotoxin and (±)-perhydrogephyrotoxin. Bulletin of the Chemical Society of Japan, 88(4), 522–537. https://doi.org/10.1246/bcsj.20140398

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