NbCl5-catalyzed [2 + 2 + 2] cycloaddition of nitriles with alkynes was used to synthesize pyrimidine derivatives. In this reaction, the use of individual Lewis acids, namely NbCl5 and FeCl3, is a key strategy for achieving the reaction using a catalytic amount of NbCl5. The roles of the two Lewis acids were investigated using FT-IR spectroscopy. The results showed that NbCl5 served as an efficient
NbCl 5催化的
炔烃与腈的[2 + 2 + 2]环加成反应用于合成
嘧啶衍
生物。在该反应中,使用单独的
路易斯酸,即NbCl 5和FeCl 3,是使用催化量的NbCl 5实现反应的关键策略。使用FT-IR光谱研究了两种
路易斯酸的作用。结果表明,NbCl 5可作为有效的
路易斯酸用于腈活化反应,而FeCl 3对路易斯
嘧啶显示出更强的
路易斯酸度,从而将NbCl 5释放到催化循环中。