Scheme 1.
Synthetic routes for the sinapic acid analogs. Reagents and conditions: (i) Pyridine, piperidine, 22 h, rt; (ii) CH3CN, K2CO3, 70 °C, 12 h; (iii) THF, LiAlH4, 0 °C, 2 h; (iv) Oxalic dichloride, DMF, 0 °C, 5 h
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