Scheme 1.
Reagents and Conditions: (i) 4-R-PhCH2Cl, K2CO3, Acetone, reflux, 8h (ii) N2H4. H2O 160°C, 5h (iii) ArCHO, EtOH, 60°C, 2h (iv) NaN3, DMSO, rt-50°C, 4h (v) NH4Cl, EtOH/H2O, Zn, reflux, 4h (vi) 10% Pd/C, H2, EtOH
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