作者:M. J. Bausch、L.-H. Wang
DOI:10.1002/poc.610061102
日期:1993.11
separate experiments, the monomethylated species 5 and 6 were allowed to react with diazomethane in efforts to develop a sequence of reactions that reasonably accounts for the formation of 2–4. Whereas N- and O-methylated products were obtained when 5 was treated with ethereal diazomethane, the reaction of 6 and diazomethane produced only the N-alkylated product 1-phenyl–2,4-dimethylurazole (in quantitative
使用醚重氮甲烷作为甲基化剂对1-苯基脲基(1)进行彻底的甲基化,形成三种产物:1-苯基-3,5-二甲氧基-1,2,4-三唑(2),1-苯基-3-甲氧基-4-甲基- Δ 2 -1,2,4- triazolinev5酮(3)和1-苯基-2,4- dimethylurazole(4)。基于分离的2-4的量,这些反应的总收率通常> 90%。当1和重氮甲烷被允许在导致一单甲基化的类似物的形成一种时尚,1-苯基-3-甲氧基- Δ反应2形成了1,2,4-三唑啉-5-酮(5)和1-苯基v2-甲基尿唑(6)。在单独的实验中,允许单甲基化的物种5和6与重氮甲烷反应,以努力开发合理解释2–4形成的一系列反应。而Ñ -和ö甲基化的5时用醚重氮甲烷处理,得到产品,6进行反应和重氮甲烷仅产生的Ñ-烷基化产物1-苯基–2,4-二甲基尿唑(定量收率)。这些实验的结果与一系列反应一致,在这些反应中,首先用重氮甲烷处理1,形