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
Nucleophilic displacement 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]
容易获得的α,α-二溴酮与过量的吗啉进行亲核置换,得到相应的酮缩醛,在OHOH存在下与氨基胍在MeOH中缩合后,得到95%以上的5-取代的3-氨基-1,2,4-三嗪区域选择性和45-76%的分离产率。[反应:看文字]