Synlett 2003(15): 2309-2312  
DOI: 10.1055/s-2003-42471
LETTER
© Georg Thieme Verlag Stuttgart · New York

A Convenient One-Pot Synthesis of Substituted 1,1-Dicyanocyclopropanes from Sulfonium Salts, Malononitrile, and Carbonyl Compounds

Aleksandr Shestopalova, Lyudmila Rodinovskayaa, Anatoliy Shestopalov*a, Sergey Zlotina, Vladimir Nesterovb
a N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
Fax: +7(095)1345905; e-Mail: shchem@dol.ru.;
b Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, Russian Federation
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Publication History

Received 23 July 2003
Publication Date:
07 November 2003 (online)

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Abstract

The three-component reaction of sulfonium salts 1, malononitrile 3, and aldehydes 2 in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) or in EtOH in the presence of Et3N is a convenient one-pot method for synthesis of substituted 1,1-dicyanocyclopropanes (7 and 9). The reaction of compounds 1-3 occurs stereoselectively to form substituted trans-cyclopropanes (7), whose structures were confirmed by the data of physicochemical methods, including X-ray diffraction analysis. The yield of cyclopropanes produced by the reaction in the ionic ­liquid is 8-21% higher than that in EtOH.