Preparation of <i>N</i>,<i>N</i>-Dimethyl-<i>N</i>′-Arylureas
Using <i>S</i>,<i>S</i>-Dimethyl
Dithiocarbonate as a Carbonylating Reagent
作者:Rita Fochi、Iacopo Degani、Claudio Magistris、Mara Migliaccio
DOI:10.1055/s-0028-1083340
日期:——
methanesulfenyl chloride, bromine, and methanesulfenyl bromide) to give N,N-dimethylcarbamoyl chloride or bromide; (3) in situ reaction with primary arylamines. All the target products were obtained in high yields (85-98%; 16 reactions, average yield 93%) and with high purity. Also noteworthy is the recovery of byproducts of industrial interest, namely methanethiol and dimethyl disulfide, with complete exploitation
报道了使用S,S-二甲基二硫代碳酸酯作为光气替代物来制备N,N-二甲基-N'-芳基脲的新的通用方法。该方法已经按照四个步骤建立,所有步骤包括三个步骤:(1)S,S-二甲基二硫代碳酸酯与二甲胺反应得到S-甲基N,N-二甲基硫代氨基甲酸酯;(2)用各种卤化剂(氯,甲磺酰氯,溴和甲磺酰溴)卤化,得到N,N-二甲基氨基甲酰氯或溴化物;(3)与伯芳基胺原位反应。所有目标产物均以高收率(85-98%; 16个反应,平均收率93%)和高纯度获得。同样值得注意的是,在完全利用试剂S,S-二甲基二硫代碳酸酯的情况下,回收了具有工业价值的副产品,即甲硫醇和二甲基二硫化物。 脲-S,S-二甲基二硫代碳酸酯-卤代甲基硫杂化-卤化-羰基化