Synthesis 2007(14): 2125-2134  
DOI: 10.1055/s-2007-983746
PAPER
© Georg Thieme Verlag Stuttgart · New York

Simple and Effective Protocol for Claisen-Schmidt Condensation of Hindered Cyclic Ketones with Aromatic Aldehydes

Valeriy Vashchenko*, Lidiya Kutulya, Alexander Krivoshey
STC ‘Institute for Single Crystals’, National Academy of Sciences of Ukraine, Lenin Avenue 60, Kharkov 61001, Ukraine
Fax: +38(057)3409343; e-Mail: valeravv@isc.kharkov.com;
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Publication History

Received 9 January 2007
Publication Date:
03 July 2007 (online)

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Abstract

A simple and effective methodology for Claisen-Schmidt condensation of (-)-menthone and other hindered cyclic ketones with aromatic aldehydes under highly basic conditions using a polar aprotic solvent and a strong base (alkali metal hydroxide or an alkoxide) is described and discussed.

30

Atom coordinates, crystallographic parameters, and full set of bond lengths and valence angles for the structure are deposited in Cambridge Crystallographic Data Centre (CCDC 645484); detailed analysis of the structure features for this compound will be published elsewhere.

46

For compound 3a, reference 18a gives only an 80 MHz 1H NMR spectrum in CCl4.