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Table 1 Yields of benzopyran (4a) under diverse conventional heating and MWI conditions

From: A facile and one-pot synthesis of new tetrahydrobenzo[b]pyrans in water under microwave irradiation

Entry

Solvent

Condition

Conventional

MWI

Time (h)

Yielda (%)

Time (h)

Yielda (%)

1

R.T

12.0

6.0

2

Heat

10.0

6.0

3

n-Hexane

R.T

10.0

4.0

4

Toluene

R.T

10.0

4.0

5

THF

R.T

5.0

5

2.5

13

6

CH3CN

R.T

5.5

6

3.0

10

7

DMF

R.T

6.0

9

2.5

15

8

MeOH

R.T

3.5

67

2.5

71

9

EtOH

R.T

2.5

71

0.5

84

10

H2O

R.T

3.0

79

0.20

98

  1. All products were characterized by 1HNMR, 13C NMR, 15N NMR and HR-MS spectral data
  2. aIsolated yields; –: no reaction