Benzimidazolium Dihydrogen Phosphate: A Novel Green Catalyst for the Preparation of Pyrano[۲,۳-𝑑]pyrimidines and Pyrano[۳,۲-𝑐]chromenes in Aqueous Media

In this study, a novel benzimidazole-based Brönsted acidic ionic salt, benzimidazolium dihydrogen phosphate, was synthesized and characterized using Mass spectrometry, FT-IR and NMR spectroscopy, as well as ICP analysis. The salt demonstrated efficient catalytic properties and reusability in the production of pyrano[۲,۳-d]pyrimidine and pyrano[۳,۲-c]chromene derivatives. Noteworthy advantages of this approach include the minimal catalyst requirement, straightforward work-up process, brief reaction duration, high yields, and catalyst reusability for four consecutive uses without a significant decrease in efficiency.

کلیدواژه ها:

Brönsted acidic organic salt ، benzimidazolium dihydrogen phosphate ، Pyrano[۲ ، ۳-𝑑]pyrimidines ، Pyrano[۳ ، ۲-𝑐]chromenes ، Aqueous media