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Reagent and conditions for synthesis of 3: (i) 1, B2O3, ethyl acetate, 90 °C; (ii) 2, n-(BuO)3B, ethyl acetate, 90 °C; (iii) n-BuNH2, ethyl acetate, 90 °C; (iv) hydrochloric acid (1M, aq.), 50 °C; synthesis of 4: (i) 3, B2O3, ethyl acetate, 90 °C; (ii) 2, n-(BuO)3B, ethyl acetate, 90 °C; (iii) n-BuNH2, ethyl acetate, 90 °C; (iv) hydrochloric acid (1M, aq.), 50 °C; synthesis of 4f: 1, 2, B2O3, morpholine, AcOH, 40 min, microwave irradiation (300 W).
