The formation of tetrahydroindeno[1,2-b]indol-10-ones 1 by reaction of ninhydrin with substituted anilines is described. The tetrahydroindeno[1,2-6]indol-10-ones 1 rearrange to form 5,11-dihydro-benzopyran[4,3-b] indol-5-ones 8 when heated under acid conditions. Reaction of ninhydrin with 3-hydroxyaniline gave a benzo[b]indeno[2,1-d]furan 4.
All Science Journal Classification (ASJC) codes
- Organic Chemistry