Synthesis of 5-(functionalized acyl)-1,3-dialkyl-substituted barbituric and 2-thiobarbituric acids
作者:Hanafi H. Zoorob、Mohamed A. Ismail、Lucjan Strekowski
DOI:10.1002/jhet.5570380207
日期:2001.3
A sodium derivative of 1,3-dimefhylbarbituric acid or 1,3-diethyl-2-thiobarbituric acid undergoes an efficient monoacylation at C5 by the reaction with ω-chloroalkanoyl chloride or diacid dichloride in the presence of pyridine in tetrahydrofuran. A nucleophilic displacement of the chlorine in a 5-chloroacetyl-bartiburate can be accomplished by using a one-pot procedure. By contrast, a similar transformation
在吡啶中,在四氢呋喃中,通过与ω-氯代烷酰氯或二酸二氯化物反应,在1,C5处对1,3-二苯甲基巴比妥酸或1,3-二乙基-2-硫代巴比妥酸的钠衍生物进行有效的单酰化反应。可以通过一锅法完成5-氯乙酰基-bartiburate中氯的亲核取代。相反,对5-(氯丁酰基)巴比妥酸的类似转化需要在非亲核碱基存在下进行分子内环化,然后用亲核试剂处理所得的5- [4,5-二氢(3 H)-2-呋喃基] ]巴比妥酸盐。