Two step synthesis of pyrido[2,3-d]pyrimidines from acyclic precursors. Cyclization of 2-cyanamino-4,6-diphenylpyridine-3-carbonitrile by Hydrogen Halides
作者:Pedro Victory、Joan Cirujeda、Anton Vidal-Ferran
DOI:10.1016/0040-4020(95)00585-v
日期:1995.9
The cyclization of 2-cyanamino-4,6-diphenylpyridine-3-carbonitrile promoled by hydrogen halides takes place regiospecifically leading in all the cases to the 4-amino-2-halogen substituted pyrido[2,3-d]pyrimidine. This procedure completes a flexible and straightforward approach to aromatic pyrido[2,3-d]pyrimidines from acyclic precursors.
卤化氢使2-氰氨基-4,6-二苯基吡啶-3-甲腈环化,在所有情况下都发生区域特异性反应,导致4-氨基-2-卤素取代的吡啶并[2,3- d ]嘧啶。该方法完成了从无环前体制备芳族吡啶并[2,3-d]嘧啶的灵活而直接的方法。