Journal
CHEMICAL COMMUNICATIONS
Volume 59, Issue 55, Pages 8600-8603Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3cc02213g
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This article describes a base-mediated unexpected aminative carbo-cyclization of cyano-enynyl esters, generated from Morita-Baylis-Hillman (MBH) acetates of propiolaldehydes, with secondary-amines. This metal-free reaction allows the synthesis of a unique cyclopentenone bearing an exocyclic double bond (cyano-olefin) with high E-selectivity in good yields. The synthetic potential of this annulation was further exemplified by the derivatization of bioactive molecules, a scale-up synthesis and synthetic transformations of the obtained cyclopentenone.
A base-mediated unexpected aminative carbo-cyclization of cyano-enynyl esters, generated from Morita-Baylis-Hillman (MBH) acetates of propiolaldehydes, with secondary-amines is described. This metal-free reaction allows the synthesis of a unique cyclopentenone bearing an exocyclic double bond (cyano-olefin) with high E-selectivity in good yields. The synthetic potential of this annulation was further exemplified by the derivatization of bioactive molecules, a scale-up synthesis and synthetic transformations of the obtained cyclopentenone.
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