A straightforward chemoselective protection of anilines as N-TBS derivatives is described by using a suitable deprotonation of the amine with methyllithium in the environmentally friendly and safer substitute of THF, 2-methyltetrahydrofuran, under exceptional mild reaction conditions (0 °C, 30 min). Interestingly, the protecting group maybe cleaved efficiently by simple treatment of N-TBS-anilines with silica gel in ethanol–water.
描述了一种简单直接的
化学选择性保护
苯胺的方法,通过在环境友好且更安全的THF替代品——
2-甲基四氢呋喃中,使用
甲基锂对
氨基进行适当的去质子化,在非常温和的反应条件下(0°C,30分钟),将其转化为N-TBS衍
生物。有趣的是,通过在
乙醇-
水中用
硅胶简单处理N-TBS-
苯胺,可以有效地去除保护基团。