Diels‐Alder reaction of 1,3‐diarylisobenzofurans with cyclopenten‐1‐one as well as 2‐cyclohexen‐1‐one in the presence of TMSOTf in DCM at 0 °C furnished 4,5‐diarylbenzo[e]inden‐1‐ones and 6,7‐diarylbenzo[f]α‐tetralones. The benzo[e]inden‐1‐ones/benzo[f]α‐tetralones upon Fischer indolization led to the formation of indeno[b]indoles and dihydronaphtho[a]carbazoles, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.