Squaramide-Quaternary Ammonium Salt as an Effective Binary Organocatalytic System for Oxazolidinone Synthesis from Isocyanates and Epoxides
作者:Ali Rostami、Amirhossein Ebrahimi、John Husband、Muhammad Usman Anwar、Rene Csuk、Ahmed Al-Harrasi
DOI:10.1002/ejoc.202000153
日期:2020.3.31
organocatalyst for the atom‐economic conversion of a plethora of alkyl‐ and aryl‐substituted epoxides and isocyanates into oxazolidinones is described. A mechanism was proposed wherein the nucleophilic ring‐opening operation, and oxo‐ and carbamate‐anions stabilization occur cooperatively towards isocyanate fixation.
探戈需要两个步骤:方酸-季铵盐是一种有效的二元有机催化剂,用于将大量烷基和芳基取代的环氧化物和异氰酸酯原子经济转化为恶唑烷酮。提出了一种机制,其中亲核开环操作以及氧代和氨基甲酸酯阴离子的稳定作用共同作用于异氰酸酯固定。