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Reagents and conditions: (a) TEA, DMAP, DMF, r.t., 24 h (57–67%); (b) LiOH, MeOH/H2O, r.t., 48 h (62–89%); (c) TEA, DMAP, DMF, r.t., 24 h; (d) piperidine, DCM, room temperature (r.t.), 30 min (71%, over two steps).
