A Regioselective Approach to 5-Substituted-3-amino-1,2,4-triazines
作者:John Limanto、Richard A. Desmond、Donald R. Gauthier、Paul N. Devine、Robert A. Reamer、R. P. Volante
DOI:10.1021/ol034602+
日期:2003.6.1
Nucleophilicdisplacement of readily available alpha,alpha-dibromoketones with excess morpholine gave the corresponding ketoaminals, which upon condensation with aminoguanidine in MeOH in the presence of AcOH afforded 5-substituted-3-amino-1,2,4-triazines in >95% regioselectivity and 45-76% isolated yield. [reaction: see text]