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.
醛烯胺与6-azapterins和6-azalumazines(pyrimido [4,5- ] -1,2,4-triazines)的反电子需环加成在区域上导致6-取代的5-deazapterins和5-deazalumazines(pyrido [2 ,3- ]嘧啶)。通过分别衍生自环戊酮和环己酮的烯胺形成5,6-融合的环戊烯和环己烯衍生物。