Research Article
Pentafluoropropionic Acid: An Efficient and Metal-Free Catalyst for the One-Pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives
Table 2
Synthesis of tetrahydrobenzo[b]pyrans using pentafluoropropionic acid as catalysta.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Aromatic aldehyde (1 mmol), dimedone (1 mmol), malononitrile (1.2 mmol), and PFPA (35 mol%) in the mixture of EtOH : H2O (1 : 1). bThe products were characterized by comparison of their spectroscopic and physical data with those reported in the literature. cIsolated yield. |