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Reagents and conditions: i) Et3N, CH2C12, 0°C to rt; ii) 10% NaOH, HC1; iii) PhCH2NH2, HOAc, reflux, iv) piperidine, ethanol, reflux 1 h.
b. Reagents and conditions: (i) C1SO2CH2COOCH3, triethylamine/ THF, N2, rt, 3 h; (ii) 10% NaOH in H2O; (iii) CH3COOH, C6H5CH2NH2; (iv) piperidine, ethanol, reflux, 5 min.
