Zeghough Djidel, Laib Nouari, Ouali Dehimi
Jul 1, 2005
Citations
0
Influential Citations
2
Citations
Journal
Heterocycles
Abstract
3,3'-Dichlorobenzidine is used for the preparation of 7,7'-dichloro-2,2'-diethoxycarbonyl-5,5'-bis-lH-indole. This was accomplished by converting the diamine to the diazonium salts. Reduction of this diazonium salts afforded dihydrazine which was condensed with ethyl pyruvate to give dihydrazone that is separated on column chromatography to provide the following isomers: syn-syn, syn-anti and anti-anti. Cyclization of the dihydrazone using polyphosphate ester gave 7,7'-dichloro-2,2'-diethoxycarbonyl- 5,5'- bis-1H-indole.