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Reagents and conditions: (a) Na(OAc)3BH, NMP, rt; (b) di-tert-butyl dicarbonate, EtOAc, H2O, rt, 17–43% (over 2 steps); (c) R2OH or R2NH2, EtOH, 50 °C, 42–88%; (d) trifluoroacetic acid, EtOH, rt, 48–92%.
