Fig. 4. : reaction and conditions (i: isopropanol, reflux, 16 h; ii: Et3N, DMF, RC6H4SO2Cl, CH2Cl2, r.t., 4 h; iii: H2, Pd/C 10%, EtOH, r.t., 16 h; iv: HCl gas, EtOH, r.t., 4 h).
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