A CuI-catalyzed, hydrazine-free transformation of 2-(2-bromoarylidene)guanylhydrazone hydrochlorides using Cs2CO3 as a base and DMEDA as a ligand at 120 °C for 5 h delivers substituted 1H-indazoles with yields up to 75%. The C,N double bond configuration of the substrates was determined by NMR experiments and quantum chemical calculations. The reaction mechanism was studied using quantum chemical calculations
使用 Cs 2 CO 3作为碱和
DME
DA 作为
配体在CuI 催化下无
肼转化 2-(2-
溴亚芳基)脒腙盐酸盐,在 120 °C 下转化5 小时,生成取代的 1 H-
吲唑,产率高达 75 %。底物的 C,N 双键构型由核磁共振实验和量子
化学计算确定。使用量子
化学计算研究了反应机理。