Lanthanide-catalyzed cyclocarbonylation and cyclothiocarbonylation: a facile synthesis of benzannulated 1,3-diheteroatom five- and six-membered heterocycles
作者:YuFeng Jing、RuiTing Liu、YangHui Lin、XiGeng Zhou
DOI:10.1007/s11426-014-5149-0
日期:2014.8
La[N(SiMe3)2]3 proves to be an efficient catalyst system for the cyclocarbonylation of 1,2-disubstituted benzenes with isocyanates. In this approach, aryl/alkyl isocyanates react with o-phenylenediamine, o-aminophenol, o-aminothiophenol, catechols and anilines ortho-substituted by CH2NH2 and CONH2 to form, respectively, the corresponding benzimidazolones, benzoxazolones, benzothiazolones, benzodioxolones, 3,4-dihydroquinazolin-2(1H)-one, and quinazolinediones. These results represent the first example of lanthanide-catalyzed carbonylation. This methodology is also applicable for the preparation of various benzannulated 1,3-diheteroatom cyclic thioketones starting from aryl/alkyl isothiocyanates or CS2 in good to excellent yields. Based on the results of experiments performed using an o-aminobenzamido dianion lanthanide complex, a general mechanism, involving the tandem reaction of two lanthanide-ligand bonds with one heterocumulene molecule, is proposed as well.
La[N(SiMe3)2]3 被证明是一种有效催化体系,用于
异氰酸酯与1,2-二取代苯的环碳酰化反应。在此过程中,芳基/烷基
异氰酸酯与
邻苯二胺、邻
氨基苯酚、邻
氨基
硫酚、
邻苯二酚、以及邻位被CH2NH2和CONH2取代的
苯胺反应,分别生成相应的
苯并咪唑酮、苯并
噁唑酮、
苯并噻唑酮、苯并
二氧六环酮、3,4-二氢
喹唑啉-2(1H)-酮以及
喹唑啉二酮。这些结果代表了
镧系元素催化碳酰化反应的首例。这一方法还适用于以芳基/烷基异
硫氰酸酯或CS2为原料,在良好至优异的产率下制备各种苯并稠合的1,3-二杂原子环
硫酮。基于使用邻
氨基苯甲酰胺双负离子
镧系络合物进行的实验结果,提出了一个涉及
镧系元素-
配体键与单一杂累积分子连续反应的通用机制。