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Table 3 Investigation of the effect of solvent on the synthesis of PBT at 100 ℃ in the presence of 0.04 g FNAOSiPPEA/Cu(II)

From: Preparation and application of FNAOSiPPEA/Cu(II) as a novel magnetite almondshell based Lewis acid-Bronsted base nano-catalyst for the synthesis of pyrimidobenzothiazoles

Entry

Solvent

Time (h)

Yield (%)a

1

1

97

2

EtOH

5

61

3

H2O

5

57

4

EtOH/H2O

5

48

  1. Reaction conditions: 4-nitrobenzaldehyde (1 mmol), 2-aminobenzothiazole (1 mmol), and ethyl acetoacetate (1 mmol) under 100 ℃
  2. aIsolated yield