Title:1-Ethyl-3-Methylimidazolium Cyanoborohydride Catalyzed Solvent Free
Microwave Assisted One Pot Multicomponent Synthesis of Tetrahydrobenzo[
b]Pyran Derivatives
Volume: 19
Issue: 6
Author(s): Rajesh K. Manjul, Vilas B. Gade*, Dhananjay N. Gaikwad, Dayanand M. Suryavanshi, Anjali S. Rajbhoj and Suresh T. Gaikwad*
Affiliation:
- Department of Chemistry, Arts, Science & Commerce College, Mokhada, Dist: Palghar, MH 401604, India
- Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, MH 431004, India
Keywords:
Tetrahydrobenzo[b]pyran, microwave irradiation, solvent free, ionic liquid, FT-IR, TLC.
Abstract: We present a facile and environmentally benign protocol for the synthesis of tetrahydrobenzo[
b]pyran derivatives via multicomponent condensation of dimedon, malononitrile and different aromatic
aldehydes in the presence of 1-ethyl-3-methylimidazolium cyanoborohydride ([EMIm][BH3CN])
as catalyst under microwave irradiation. The one-pot synthesis, facile solvent-free condition and good
isolated yield illustrate the utility of this green approach. The structural features are derived using analytical
tools, including Fourier Transform Infrared Spectroscopy (FT‐IR) and 1H and 13C Nuclear Magnetic
Resonance (NMR) Spectroscopy. Electronic synthesis of tetrahydrobenzo[b]pyran derivatives by
using catalytic action of 1-ethyl-3-methylimidazolium cyanoborohydride has been used to obtain maximum
yield.