Phosphine mediated (3 + 2) cycloaddition of electron-poor terminal alkynes: a concise route to pre-methylenomycin C lactone.

08 May 2025, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Herein, we report a (3 + 2) cycloaddition to deliver an array of cyclopentenes. Typically, the reaction involves electron-poor terminal alkynes and ketomalonate partners, however numerous structural modifications to the coupling partners have been accommodated to enable 45 examples of the reaction to be completed. Mechanistic studies highlight the role of alkyne slow addition to avoid undesired alkyne deprotonation. Application to the synthesis of pre-methylenomycin C lactone, an inter-mediate in methylenomycin biosynthesis with potent activity against Gram-positive bacteria, demonstrates the robust nature and good scalability of the reaction.

Keywords

Organic synthesis
natural products
cycloaddition
methylenomycin

Supplementary materials

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Supporting information detailing preparation of all new materials and NMR data
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