Free Radical Alkylation of 1,3-Dimethyluracils and Caffeine with Benzoyl Peroxide
作者:Toshio Itahara、Naoko Ide
DOI:10.1246/bcsj.65.2045
日期:1992.8
3-dimethyluracils, although a steric effect of the methyl group at 6-position complicated the reaction. On the other hand, a similar treatment of 1,3-dimethylthymine led to alkylation of the methyl group at 5-position. The reaction of caffeine gave 8-alkylcaffeines and alkyl acetates were used as favorable solvents with respect to synthesis of 8-alkylcaffeines.
1,3-二甲基尿嘧啶和 1,3,6-三甲基尿嘧啶与过氧化苯甲酰在环己烷、乙酸乙酯和乙腈中反应得到相应的 5-烷基-1,3-二甲基尿嘧啶,尽管甲基在 6-位置使反应复杂化。另一方面,1,3-二甲基胸腺嘧啶的类似处理导致5-位甲基的烷基化。咖啡因反应得到 8-烷基咖啡因,乙酸烷基酯用作合成 8-烷基咖啡因的有利溶剂。