B. Joseph et al., SYNTHESIS OF -DIHYDROBENZO[4,5]CYCLOHEPT[1,2-B]INDOL-12(5H)-ONE AND RELATED-COMPOUNDS, Journal of heterocyclic chemistry, 34(2), 1997, pp. 525-531
The synthetic routes of -dihydrobenzo[4,5]cyclohept[1,2-b]indol-12(5H)
-one 5 from either 1-methyl or 1-sulfonylindole-2-carboxaldehyde 1 or
ethyl 1,2-dimethylindole-3-carboxylate 6 are reported. The structure o
f the ketone 5a was confirmed by X-ray crystallography. Several indole
derivatives have been prepared with potential antitumor activity.