Table 2 Optimization of the reaction conditions for the synthesis of 4a.

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

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Entry

Condition

Catalyst amount (mg)

Time (min)

Yield (%)

1

EtOH, reflux

–

35

29

2

EtOH, reflux

20

35

94

3

EtOH, reflux

40

35

88

4

EtOH, reflux

60

35

68

5

EtOH:H2O, 80 °C

20

35

40

6

CH3CN, reflux

20

35

51

7

CHCl3, reflux

20

35

40

8

CH2Cl2, reflux

20

35

30

9

Solvent-free, 110 °C

20

35

55

  1. Significant values are in bold.
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