β,β-Diacyl-enamines and -enoles, III Formylation of CH2-acidic Compounds via the Anilinomethylene Derivatives
Open Access
- 1 February 1979
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 34 (2) , 283-289
- https://doi.org/10.1515/znb-1979-0229
Abstract
Three component condensation of active methylene compounds with aniline and trialkyl orthoformate gives anilinomethylene-1,3-dicarbonyls, which can be hydrolysed with aqueous K2CO3, KOH or HCl, depending on the sensitivity of the hydroxymethylene derivative thus formed. The reactions sequence is fairly generally applicable: Cyclohexan-1,3-diones, pyrimin-3,5-diones (including barbituric acids), pyrazolones and pyrazolin-3,5-diones, indan-1,3-dione, (thio)phthalide, indoxyl, oxindole, anthrone, 2,6- and 2,7-dihydroxynaphthalene, and pentan-2,4-dione have been formylated. Using orthoacetate or orthopropionate, tetronic acid, pyrazolones and pyrazolin-3,5-diones,resp.,could also be acylated by this method.Keywords
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