Abstract
To one pot synthesis of coumarins with benzimidazol or benzoxazol moieties, three different microwave irradiations based procedures are reported here which take place within a few minutes. In spite of fairly well yield of the products using solvent free procedures, 25–30% further yields were achieved within 3 minutes at 110 °C using 2 mL n-pentanol as solvent.
Notes
Note. The 900 W was used as microwave power, and the reported times and temperature were compared with literature (lit.).
Note. The 900 W was used as microwave power, and the reported times and temperature were compared with literature (lit.).
Note. The 900 W was used as microwave power, and the reported times and temperature were compared with literature (lit.).
a λ abs: maximum absorption wavelength; ε: corresponding molar absorption coefficient; λ em: maximum emission wavelength.
b Maximum excitation wavelength was measured at 230 nm.