Synthesis of pyrazolo[3,4-<i>d</i>]pyrimidine derivatives using ketene dithioacetals
作者:Yoshinori Tominaga、Yasumasa Honkawa、Mayumi Hara、Akira Hosomi
DOI:10.1002/jhet.5570270355
日期:1990.3
reaction of ketene dithioacetals 1a,b [1a: bis(methylthiomethylenemalononitrile; 1b: bis(methylthio)methylenecyanoacetamide] with hydrazines (hydrazine hydrate, phenylhydrazine, p-chlorophenylhydrazine, p-nitrophenylhydrazine), with formamide or carbon disulfide proceeded to give the corresponding 4-amino- or 4-hydroxy-3-methylthiopyrazolo[3,4-d]pyrimidines 6a-h in good yields. 3-Aminopyrazolo[3,4-d]pyrimidine
的5-氨基-3- methylthiopyrazole -4-腈或4-甲酰胺环化3A-J ,这是由乙烯酮二硫反应制备1A,B [1A:双(methylthiomethylenemalononitrile; 1B:二(甲硫基)methylenecyanoacetamide]与肼(水合肼,苯肼,p -chlorophenylhydrazine,p -nitrophenylhydrazine)与甲酰胺或二硫化碳进行,得到相应的4-氨基-或4-羟基-3- methylthiopyrazolo [3,4 d ]嘧啶6A-H在3-氨基吡唑并[3,4- d ]嘧啶衍生物6i-1 通过应用3,5-二氨基吡唑与甲酰胺的环化反应也获得了它们。