作者:Wei He、Bang‐Le Zhang、Zhong‐Jie Li、Sheng‐Yong Zhang
DOI:10.1081/scc-200057274
日期:2005.5.1
Indole derivatives have been efficiently synthesized from ethyl 2-phenylhydrazono-5-phthalimido-pentanoate and its derivatives, which were obtained by Japp-Klingmann reaction under phase-transfer catalytic (PTC) conditions. Several different phase-transfer catalysts were investigated and dimethyldioctadecyl ammonium chloride (DMDOA) was found to promote this reaction efficiently. Using DMDOA as the PTC, aryl hydrazones were obtained in yields of 90%. The pure aryl hydrazones were then efficiently cyclized to indole derivatives in yields of more than 80%.