Succinimide-N-sulfonic Acid as a Recyclable Brönsted Acid Catalyst for Synthesis of Pyrano[4,3-b]pyran Derivatives by Using Solar Energy Under Solvent-Free Conditions

ABSTRACT

Succinimide-N-sulfonic acid as an efficient Brönsted acid catalyzed the synthesis of pyrano[4,3-b]pyrans by using solar energy as a green source of energy under solvent-free conditions. This method has the advantages of high yield, short reaction time, and clean and simple methodology. The catalyst could be recycled without significant loss of activity.

KEYWORDS:

• Brönsted acid
• one-pot three-component reaction
• pyrano[4,3-b]pyran
• solar energy

Funding

The authors are thankful to the financial support from University Malaya to Project GC 001A-14-AET.