Pyrimidines.<b>8</b>. chlorination of 6-methyluracil with phosphorus oxychloride in the presence of trialkyamines
作者:Herman Gershon、Anthony Grefig、Donald D. Clarke、Herman Gershon
DOI:10.1002/jhet.5570240137
日期:1987.1
The effect of the tertiary amines triethyl, tri-n-propyl, and tri-n-butylamines on the chlorination of 6-methyluracil by phosphorus oxychloride was studied. A comparison with the reaction of preformed 2,4-dichloro-6-methylpyrimidine and triethylamine in toluene was made. The reaction in phosphorus oxychloride in the presence of triethylamine afforded low yields of 2-diethylamino derivative after short
叔胺三乙基,三-的效果Ñ丙基,和三- Ñ研究了丁胺对氯氧磷氯化6-甲基尿嘧啶的影响。与预先形成的2,4-二氯-6-甲基嘧啶和三乙胺在甲苯中的反应进行了比较。在三乙胺存在下在三氯氧化磷中的反应在短时间加热后提供了低产率的2-二乙基氨基衍生物,在沸腾188小时后提供了高产率的2,4-双(二乙基氨基)衍生物。在三乙胺存在下在甲苯中加热预形成的2,4-二氯-6-甲基嘧啶,主要得到2-二乙基氨基嘧啶以及少量的4-二乙基氨基异构体。188小时后,产物混合物由87%的2-二乙基氨基和13%的4-二乙基氨基异构体组成。尽管取代基的方向基本相同,