I. Walz, Andreas Bertogg, A. Togni
Jun 1, 2007
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0
Influential Citations
22
Citations
Journal
European Journal of Organic Chemistry
Abstract
Vanadium(IV) species generated in situ from V(salen)Cl2 complexes (1) by reaction with 2 equiv. of AgSbF6 are effective catalysts for Nazarov cyclizations. Thus, dialkenyl ketones bearing α-ester groups are efficiently converted to corresponding cyclopentenones in good yields at room temperature, in the presence of 2 mol-% catalyst. Under such conditions full conversion takes place within minutes for substrates bearing an electron-donating group at position 1 of the 1,4-dien-3-one system.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)