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Reagents and conditions: (i) diethyl carbonate, NaH, benzene, reflux, 90% (3a, n = 1), 85% (3 b, n = 2); (ii) (substituted) resorcinol, CF3COOH, conc. H2SO4, 0 °C; rt, 3 h; (iii) appropriate sulphonyl chloride derivative, triethylamine, CH2Cl2, 0 °C; rt, 1 h.
