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。