Cross-condensation of derivatives of cyanoacetic acid and carbonyl compounds. 2. One-pot synthesis of substituted 2-amino-7-methyl-5-oxo-4,5-dihydropyrano[4,3-b]pyrans in ethanol and ionic liquid [bmim][PF<sub>6</sub>]
作者:A. M. Shestopalov、S. G. Zlotin、A. A. Shestopalov、V. Yu. Mortikov、L. A. Rodinovskaya
DOI:10.1023/b:rucb.0000035640.47443.a4
日期:2004.3
The three-component reaction of 4-hydroxy-6-methylpyran-2(2H)-one with cyanoaceticacidderivatives and carbonyl compounds in EtOH or in the ionic liquid, viz., 1-butyl-3-methylimidazolinium hexafluorophosphate ([bmim][PF6]), affords substituted 2-amino-7-methyl-5-oxo-4,5-dihydropyrano[4,3-b]pyrans. The yield of substituted pyrano[4,3-b]pyrans in [bmim][PF6] is by 10—14% higher than that in EtOH.