作者:S. K. Drusvyatskaya、B. V. Lopatin、A. F. Bekhli、A. I. Krotov、A. S. Naidenova
DOI:10.1007/bf00757688
日期:1976.5
with aromatic or heterocyclic aldehydes was effected by heating the components in acetic anhydride. Thereupon the yield of I was 80-100% (Table i). Performing this condensation in an aprotic solvent (benzene or toluene) with azeotropic removal of the water and in the presence of a catalyst was less effective, since it requires more extended heating and does not always lead to good yields of I. Apparently
与[6]的程序不同,起始的1,2-二甲基嘧啶与芳族或杂环醛的缩合是通过加热乙酸酐中的组分来实现的。于是I的产率为80-100%(表i)。在非质子溶剂(苯或甲苯)中进行这种缩合,共沸去除水并在催化剂存在下进行,效果较差,因为它需要更长时间的加热并且并不总是导致 I 的良好收率。显然,限制该反应的阶段是中间形成的烯醇[6]的脱水,该脱水在乙酸酐的作用下顺利进行。