In situ slow release of isocyanates: synthesis and organocatalytic application of N-acylureas
作者:Atul K. Singh、Ruchi Chawla、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2013.07.045
日期:2013.9
A novel, efficient, and operationally simple one-pot synthesis of both, symmetrical and unsymmetrical N-acylureas from carboxamides and in situ generated isocyanates (from N,N-dibromo-p-toluenesulfonamide) in the presence of a mild base at rt is reported. The protocol avoids the tedious isolation and purification steps of hazardous isocyanates. The first application of these acylureas to the catalysis
在室温下在弱碱存在下,由酰胺和原位生成的异氰酸酯(由N,N-二溴-对甲苯磺酰胺)合成对称,不对称的N-酰基脲的新颖,有效且操作简单的方法是报告。该协议避免了危险的异氰酸酯的繁琐分离和纯化步骤。还显示了这些酰脲在氢键催化中的首次应用。