作者:Qiao Zhang、Hao-Yu Yuan、Norihisa Fukaya、Hiroyuki Yasuda、Jun-Chul Choi
DOI:10.1002/cssc.201601878
日期:2017.4.10
Several zinc salts were employed as catalysts for the synthesis of carbamates directly from aromatic amines, CO2, and silicate esters. Zn(OAc)2 offered the best performance among the salts tested. The addition of an N‐donor ligand such as 1,10‐phenanthroline increased the yield. The best catalytic performance of Zn(OAc)2 can be explained by carboxylate‐assisted proton activation. The interaction between
几种锌盐被用作直接由芳族胺,CO 2和硅酸酯酯合成氨基甲酸酯的催化剂。Zn(OAc)2在所测试的盐中提供了最佳性能。添加N-供体配体(例如1,10-菲咯啉)可提高产量。Zn(OAc)2的最佳催化性能可以用羧酸盐辅助的质子活化来解释。底物和催化剂之间的相互作用可以通过1 H和15 N NMR光谱中的化学位移来观察。异氰酸酯是关键的中间体,它是由胺和CO 2产生的。硅酸酯最终转化为硅氧烷,由29确定Si NMR。市售的催化剂体系可以重复使用。在各种底物的作用下,分离出的氨基甲酸酯的收率可达96%,并且在存在其他官能团的情况下,催化反应具有胺选择性。