Highly substituted guanidines were conveniently prepared through a one-pot reaction between aryl isothiocyanates and amines mediated by the Ph3P–I2/Et3N system. The C 2-symmetric N,N′,N′′-substituted guanidines were readily accessed using a 1:2 molar ratio of an aryl isothiocyanate and an amine; while sequential addition of two different amines in equimolar ratios gave rise to asymmetric derivatives
高度取代的
胍可以通过异
硫氰酸芳基酯和胺之间的一锅反应方便地制备,该反应由 Ph3P-I2/Et3N 系统介导。使用 1:2 摩尔比的异
硫氰酸芳基酯和胺,可以很容易地获得 C 2 对称 N,N',N''-取代的
胍;而以等摩尔比顺序加入两种不同的胺会产生不对称衍
生物。
伯胺和仲胺都被发现优先与缺电子的异
硫氰酸芳基酯反应,在温和的条件下以良好的收率迅速提供
胍。