Synthesis 2018; 50(17): 3307-3321
DOI: 10.1055/s-0037-1610197
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© Georg Thieme Verlag Stuttgart · New York

One-Pot Conversion of Aldehydes and Ketones into 1-Substituted and 1,4-Disubstituted 1,3-Enynes

Escuela de Química, Universidad de Costa Rica, San José, 2060, Costa Rica   Email: jorge.cabezas@ucr.ac.cr
,
Rebeca R. Poveda
Escuela de Química, Universidad de Costa Rica, San José, 2060, Costa Rica   Email: jorge.cabezas@ucr.ac.cr
,
José A. Brenes
Escuela de Química, Universidad de Costa Rica, San José, 2060, Costa Rica   Email: jorge.cabezas@ucr.ac.cr
› Author Affiliations
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Publication History

Received: 01 June 2018

Accepted after revision: 05 June 2018

Publication Date:
23 July 2018 (online)


This article is dedicated to Professor Cam Oehlschlager, senior supervisor and friend

Abstract

Sequential treatment of 2,3-dichloropropene with magnesium and n-BuLi generates the operational equivalent of 1,3-dilithiopropyne, which upon treatment with aldehydes or ketones, produces the corresponding alkoxy lithium acetylide intermediates. Reaction of this alkoxide with tosyl chloride, and t-BuLi produces 1-substituted, or 1,1-disubstituted 1,3-enynes in a one-pot reaction. When this lithium acetylide intermediates, obtained by this procedure, were used to perform palladium-catalyzed cross-coupling reactions, followed by addition of thionyl chloride and pyridine, 1,4-disubstituted or 1,1,4-trisubstituted 1,3-enynes were obtained in a one-pot protocol.

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