Two general procedures were developed for the synthesis of chiral N-mono-, N, N′-di-, N, N′ N″-tri-, and N, N′, N″, N′″-tetraalkylglycolurils based on the reactions of 4,5-dihydroxy-imidazolidin-2-ones or glyoxal with one or two moles of alkylureas, respectively, by acid catalysis. The reactions of N-monoalkyl- and N, N′-dialkylureas with glyoxal proceed regioselectively. The mechanism of these reactions was suggested and partly confirmed by quantum-chemical calculations and experimental data. The enantiomeric separation of some chiral glycolurils by chiral-phase HPLC was carried out for the first time.
在 4,5-二羟基
咪唑烷-2-酮或
乙二醛分别与一或两摩尔烷基
脲在酸催化下发生反应的基础上,开发了合成手性 N-单烷基、N, N′-二烷基、N, N′-三烷基和 N, N′,N″,N′″-四烷基
乙二醛的两种一般程序。N-单烷基和 N,N′-二烷基
脲与
乙二醛的反应具有区域选择性。量子
化学计算和实验数据提出并部分证实了这些反应的机理。首次利用手性相高效
液相色谱法分离了一些手性
羟基乙醛的对映体。