Skip to main content

Table 3 Catalytic performances of NEST in comparison with some other catalysts for synthesis of 5a

From: Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

Entry Catalyst Solvent Temp (°C) Time (min) Yielda (%) [Refs.]
1 I2 H2O r.t 10 90 [49]
2 Isonicotinic acid 80 10 92 [50]
3 Piperidine H2O r.t 5–10 89 [51]
4 γ-Alumina H2O Reflux 35 90 [20]
5 Et3N EtOH Reflux 15 72 [26]
6 NESTb r.t 10 92
  1. aIsolated yield
  2. bThis work