Synthesis of indeno[2,1-<i>a</i>]pyrrolo[3,4-<i>c</i>]carbazole lactam regioisomers using ethyl<i>cis</i>-β-cyanoacrylate as a dienophile and lactam precursor
作者:Robert L. Hudkins、Chung Ho Park
DOI:10.1002/jhet.5570400118
日期:2003.1
Reported here is the synthesis and characterization of the indenopyrrolocarbazole ring system utilizing a Diels-Alder reaction with 2-indenylindole and maleimide. Clemmensen reduction of imide 10 furnished the 5-oxo (16) and 7-oxo (17) lactam regioisomers. A new regiospecific route to 5-oxo 16 was developed using ethyl cis-β-cyanoacrylate as the dienophile. The regio and stereochemical characterization