Table 4 Synthesis of diverse dihydro-pyrano[3,2-c]chromenes 4(a-m) by the Basu-proline catalysta.

From: The L-proline modified Zr-based MOF (Basu-proline) catalyst for the one‐pot synthesis of dihydropyrano[3,2-c]chromenes

  1. aReaction conditions: 4-hydroxycoumarin (1.0 mmol), malononitrile (1.0 mmol), aldehyde (1.0 mmol), and the Basu-proline catalyst (20 mg) in EtOH (3.0 mL) under reflux conditions.
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