Treatment of 6-(N-alkylanilino)-2-phenylpyrimidin-4 (3H)-ones, which were prepared by the condensation of 6-chloro-2-phenylpyrimidin-4 (3H)-one with N-alkylanilines, with the Vilsmeier reagent (dimethylformamide-phosphoryl chloride) gave the corresponding 10-alkyl-2-deoxo-2-phenyl-5-deazaflavins (III) in excellent yields. Heating of 6-chloro-5-formyl-3-phenyluracil with N-alkylanilines in dimethylformamide gave the corresponding 10-alkyl-3-phenyl-5-deazaflavins (VI) in a single step. The abilities of the 5-deazaflavins (III) and (VI) thus obtained to oxidize benzyl alcohol and benzylamine were compared, and some automatic recycling of the oxidation reactions was observed. The reaction of compounds III with benzylamine exceptionally gave the adducts, 5-benzylamino-2-deoxo-2-phenyl-5-deazaflavins.
将 6-
氯-2-
苯基嘧啶-4 (3H)-酮与 N-烷基
苯胺缩合制备的 6-(N-烷基
苯胺)-2-
苯基嘧啶-4 (3H)-酮用
维尔斯梅尔试剂(二甲基甲酰胺-
磷酰
氯)处理,可以得到相应的 10-烷基-2-脱氧-2-苯基-
5-脱氮黄素(III),产量极高。将 6-
氯-5-甲酰基-3-苯基
脲嘧啶与 N-烷基
苯胺在二甲基甲酰胺中加热,只需一步就能得到相应的 10-烷基-3-苯基-5-去氮黄素(VI)。比较了由此得到的
5-脱氮黄素(III)和(VI)氧化
苄醇和
苄胺的能力,并观察到氧化反应的一些自动循环。化合物 III 与
苄胺的反应特别生成了加合物 5-苄
氨基-2-脱氧-2-苯基-
5-脱氮黄素。