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Reagents and reactions conditions: (a) respective 3-nitrobenzenesulfonyl chloride, pyrrolidine, triethylamine, acetonitrile, 0 °C, 5 min; (b) Fe powder, NH4Cl (166 mM in water), EtOH, 80 °C, 2.5 h; (c) 1-isocyanato-4-nitrobenzene, DMF, room temperature, 4 h, 5–37% yield over three steps.
