Synthesis and properties of 7-hydroxy-8-phenylxanthine and its derivatives. Disproportionation to derivatives of 8-phenylxanthine and 6-amino-5-nitrosouracil
作者:Gury Zvilichovsky、Herzel Garbi、Eliahu Nemes
DOI:10.1002/jhet.5570190139
日期:1982.1
were synthesized by ring closure of 6-amino-5-nitrosouracil with benzaldehyde, p-methoxybenzaldehyde and p-chlorobenzaldehyde, respectively. The disproportionation of these products to the corresponding 8-phenylxanthines and 6-amino-5-nitrosouracil was studied. The dependence of the rate of the reaction on the various substituents was studied. The disproportionation reaction is inhibited by the polarophilic
通过分别用苯甲醛,对-甲氧基苯甲醛和对-氯苯甲醛将6-氨基-5-亚硝基尿嘧啶闭环合成8-苯基,8-(对甲氧基苯基)和8-(对氯苯基)-7-羟基黄嘌呤。研究了这些产物与相应的8-苯基黄嘌呤和6-氨基-5-亚硝基尿嘧啶的歧化。研究了反应速率对各种取代基的依赖性。歧化反应被亲极性的乙炔二羧酸乙酯抑制,并被磷酸盐增强。