Phosphotungstic Acid: An Efficient Catalyst for Synthesis of 2-Substituted Tetrahydroquinoline via Imino Diels–Alder Reaction and Fluorescent Studies

Abstract

For the first time Phosphotungstic acid (PTA), is used as a some new catalyst for the synthesis of tetrahydroquinoline derivatives with high yields is described. PTA a heterogeneous catalyst is inexpensive, easily available, eco-friendly, water soluble, recoverable, stable to aqueous reaction conditions and further more, these 2-methyl tetrahydroquinoline derivatives shows a remarkable fluorescence property.

Keywords:

• Fluorescence
• imino Diels–Alder reaction
• phosphotungstic acid
• reusable
• 2-substituted-1,2,3,4-tetrahydroquinoline

ACKNOWLEDGMENTS

This research work is financially supported by Council of Scientific and Industrial Research, New Delhi—110 012 (Ref. No: 01(2301)/09/EMR–II dated 19-03-2009). Ms. Kavitha C.S. Achar is grateful to UGC for the award of JRF (Ref. No: KU/Sch/UGC/RFSM/2006-07/3236 dated 08-03-2007).

Notes

^a 2 mol% PTA catalyst loaded.

^b Isolated yield.

^a Recoverd catalyst.

^b Isolated yield.