Diels-Alder Reactions of Bicyclic 1,2,4-Triazines: The Conversion of Pyrimido[4,5-]-1,2,4-triazines to Pyrido[2,3-]pyrimidines (5-Deazapteridines)
作者:Edward C. Taylor、Keith F. McDaniel、John C. Warner
DOI:10.1016/s0040-4039(00)96024-6
日期:1987.1
Inverse electron-demand cycloaddition of aldehyde enamines with 6-azapterins and 6-azalumazines (pyrimido[4,5-]-1,2,4-triazines) leads regiospecifically to 6-substituted 5-deazapterins and 5-deazalumazines (pyrido[2,3-]pyrimidines) respectively. 5,6-Fused cyclopenteno and cyclohexeno derivatives are formed with enamines derived from cyclopentanone and cyclohexanone respectively.