Rhodium-Catalyzed Arylzincation of Alkynes: Ligand Control of 1,4-Migration Selectivity
作者:Jialin Ming、Tamio Hayashi
DOI:10.1021/acs.orglett.8b02668
日期:2018.10.5
The addition of arylzinc reagents ArZnCl 1 to alkynes 2 was found to be catalyzed by rhodium complexes in the presence of a catalytic amount of zinc chloride. The selectivity in giving 2-arylalkenylzinc species 3 or ortho-alkenylarylzinc species 4, the latter of which is generated through 1,4-Rh migration from alkenyl to aryl in the catalytic cycle, is controlled by the ligands on rhodium. Ligands
发现在催化量的氯化锌存在下,铑配合物可将芳基锌试剂ArZnCl 1加至炔烃2。生成2-芳基链烯基锌物种3或邻链烯基芳基锌物种4的选择性是由铑上的配体控制的,后者通过在催化循环中从链烯基转移至芳基的1,4-Rh迁移而产生。配体鳕鱼和binap分别具有3和4的高选择性。