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(a) Alkyl halides, TEA, 56 °C, 20 h; (b) (Boc)2O, DMSO/MeOH (1:1), TEA; (c) PyBop, NMM, corresponding amine, 50% DMF/DMSO, 1 h at room temperature (RT); (d) dichloromethane (DCM)/trifluoroacetic acid (TFA) (1:1), 20 min, RT.
