Scheme 1.
Reagents and conditions: (a) lactic acid, 4 M HCl, reflux; (b) CrO3, acetic acid, 90–105 °C (c) terephthalaldehydic acid, 10% NaOH aqueous, ethanol, rt; (d) SOCl2, DMF, reflux; (e) K2CO3, DMF, Aromatic amine, 0–5 °C.
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