Scheme 2. Preparation of furan-2-carboxamide derivatives a(1–7) and furan-2-carboxylate ester derivatives b(1–7). i: SOCl2, toluene, 90–100 °C, ii: triethylamine, pyridine, 80–100 °C, 24 h, reflux. Procedure B; iii: pyridine and TEA in microwave synthesis, 15 min, 50, or 80°, * compounds with star are novel compounds.
