“On-Water” Reaction of (Thio)isocyanate: A Sustainable Process for the Synthesis of Unsymmetrical (Thio)ureas
作者:Amit Dattatray Karche、Prabakaran Kamalakannan、Rajendra Powar、Gautham G. Shenoy、Kamlesh J. Padiya
DOI:10.1021/acs.oprd.2c00266
日期:2022.11.18
“on-water” reaction of (thio)isocyanates with amines. Detailed mechanistic studies revealed that the physical nature and solubility of reagents in water are responsible for the observed reaction rate and selectivity. Significant efforts have been made to design a scalable process to achieve the “zero waste” “water-mediated” protocol for the synthesis of (thio)ureas from (thio)isocyanates and amines
我们描述了通过(硫代)异氰酸酯与胺的“水上”反应合成不对称(硫代)脲的简便、可持续和化学选择性过程。详细的机理研究表明,试剂在水中的物理性质和溶解度决定了观察到的反应速率和选择性。已经做出重大努力来设计可扩展的工艺,以实现从(硫代)异氰酸酯和胺合成(硫代)脲的“零废物”“水介导”方案。该工艺的决定性优势是通过过滤简单地分离产品和回收废水。它还避免了使用敏感的无水反应条件和有毒的挥发性有机溶剂。开发的工艺确保了化学选择性和稳健性,并成功放大生产 100 克高产量和高纯度的异丙隆。计算并比较了过程质量强度、反应质量效率和摩尔效率值(有和没有溶剂)等绿色化学参数。