Scheme 1.
i) N2H4, H2O, reflux, 6 h; ii) Et2NC6H4CHO (p-), AcOH, reflux, 1 h; iii) Ac2O, reflux, 1 h a) R= CH3, b) R= CH2CH3, c) R= CH2C6H5, d) R= CH2C6H4.CH3 (p-), e) R= CH2C6H4.Cl (p-), f) R= C6H5, g) R= cyclopropyl
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