Abstract
Indolylpyranoquinolines and indolylcyclopentaquinolines were synthesized by triphenyl phosphonium perchlorate (TPP) catalyzed imino Diels–Alder reaction of indolylimines with 3,4‐dihydro‐2H‐pyran and cyclopentadiene, respectively.
Acknowledgment
We thank the Council of Scientific and Industrial Research, New Delhi, India for financial support.