A novel and simple method for the N-alkylation of amines with different ethers as alkylating reagents has been developed, using cheap γ-Al2O3 as the catalyst at atmospheric pressure in the temperature range of 260–320°C. For example, the reaction of equimolar amounts of morpholine and diethyl ether gave N-ethylmorpholine quantitatively. The present catalytic system is applicable to the N-alkylation of both primary and secondary amines. Since only water is generated as byproduct, the protocol proved to be eco-friendly and atom-economic.
本文开发了一种新颖简单的方法,使用不同的醚作为烷基化试剂对胺进行N-烷基化反应,使用廉价的γ-Al2O3作为催化剂,在大气压下,温度范围为260–320°C。例如,等摩尔量的吗啉和乙醚反应生成了定量的N-乙基吗啉。当前的催化体系适用于一级和二级胺的N-烷基化反应。由于只生成水作为副产品,该方案被证明是生态友好和原子经济的。