Cross reactions of cyanoacetic acid derivatives with carbonyl compounds 3. One-step synthesis of substituted 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromenes
作者:A. A. Shestopalov、L. A. Rodinovskaya、A. M. Shestopalov、V. P. Litvinov
DOI:10.1007/s11172-005-0346-9
日期:2005.4
Three-component reactions of 4-hydroxycoumarin, carbonylcompounds, and malono-nitrile or alkyl cyanoacetates in ethanol in the presence of Et3N as a catalyst give substituted 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromenes.