Highly stereoselective α-hydroxyalkylation/chlorination of α,β- acetylenic ketones - An efficient approach to β-halogeno Baylis-Hillman adducts

Han Xun Wei, Sun Hee Kim, Thomas D. Caputo, David W. Purkiss, Guigen Li

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

A highly stereoselective method for the synthesis of (E)-β-halogeno Baylis-Hillman adducts has been developed. The new method involves a tandem α-hydroxyalkylation/β-chlorination of α,β-acetylenic ketones by using TiCl4 as the chlorine source for α,β-conjugate addition, and concurrently as the Lewis acid promoter for the carbonyl addition. The new system tolerates a broad scope of reactants in which aliphatic and aromatic α- acetylenic ketones can be subjected to the conjugate addition. Both aliphatic and aromatic aldehydes can also be employed as electrophilic acceptors. Good yields (61-88%) and high E/Z stereoselectivity have been obtained for the nine examples which were examined, only in one case was E/Z selectivity of 17/1 observed and the two individual isomers are separable via flash column chromatography. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)2397-2401
Number of pages5
JournalTetrahedron
Volume56
Issue number16
DOIs
StatePublished - Apr 14 2000

Keywords

  • Halogeno Baylis-Hillman adducts
  • Titanium tetrachloride
  • α,β-acetylenic ketones

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