Convenient selective synthesis of pyrano[2,3-d]pyrimidines
作者:Yu. M. Litvinov、A. M. Shestopalov
DOI:10.1007/s11172-008-0308-0
日期:2008.10
A selective method for the synthesis of substituted and annulated pyrano[2,3-d]pyrimidines consisting in acylation of 2-amino-3-cyano-4H-pyrans with acetic anhydride has been developed. It was shown for the first time that acid catalysis is more efficient in this reaction, rather than base catalysis as it has been believed earlier.