Synthesis 2013; 45(13): 1807-1814
DOI: 10.1055/s-0033-1338876
paper
© Georg Thieme Verlag Stuttgart · New York

Diastereoselective Syntheses of Highly Substituted Methylenecyclopropanes via Copper- or Iron-Catalyzed Reactions of 1,2-Disubstituted 3-(Hydroxy­methyl)cyclopropenes with Grignard Reagents

Xiaocong Xie
Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark DE 19716, USA   Fax: +1(302)8316335   Email: jmfox@udel.edu
,
Joseph M. Fox*
Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark DE 19716, USA   Fax: +1(302)8316335   Email: jmfox@udel.edu
› Author Affiliations
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Publication History

Received: 08 April 2013

Accepted after revision: 08 May 2013

Publication Date:
06 June 2013 (online)


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Dedicated to Scott Denmark in recognition of his contributions to the chemistry of strained molecules

Abstract

Described are diastereoselective syntheses of highly substituted methylenecyclopropanes from 1,2-disubstituted 3-(hydroxymethyl)cyclopropenes with allylic ether leaving groups, compounds that were constructed via alkylation of cyclopropenecarboxylic acid dianions. Substitution reactions of 1,2-disubstituted 3-(hydroxymethyl)cyclopropenes with Grignard reagents proceed with good yield and high diastereoselectivity. Under copper(I)-catalyzed conditions, the substitution reactions proceed to give syn-addition products, whereas Fe(acac)3 catalysis gives the products of anti-addition.

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