The electrochemical, nickel-catalyzed carbon dioxide incorporation into 2-haloaryl epoxides led chemoselectively to different carboxylated products according to the nature of the substrate and to the catalytic system. Whereas terminal epoxide derivatives led to cyclic carbonates in good yields, disubstituted epoxides reacted through a first carbon-halogen bond carboxylation followed by epoxide ring opening. Five-membered ring benzolactones were selectively formed with cyclam as the ligand, whereas 6-membered ring isocoumarine derivatives were obtained using 2,2′-bipyridine.
根据底物性质和催化体系的不同,电
化学镍催化
二氧化碳掺入 2-卤代
环氧化物的
化学选择性地产生了不同的羧化产物。末端
环氧化物衍
生物能以良好的收率生成环状
碳酸盐,而二取代
环氧化物则首先通过碳-卤键羧化反应,然后再进行
环氧化物开环反应。以
环己胺为
配体可选择性地生成五元环苯甲内酯,而使用 2,2′-联
吡啶则可获得六元环异
香豆素衍
生物。