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aReagents and conditions: (i) 4-methoxy-N-methylaniline, PyBop, DIEA, dichloromethane, 0°C to r.t.; (ii) trifluoroacetic acid, dichloromethane, r.t.; (iii) Boc-glycine, HATU, DIEA, dichloromethane, 0°C to r.t.; (iv) trifluoroacetic acid, dichloromethane, r.t.; (v) corresponding substituted benzenesulfonyl chloride, TEA, dichloromethane, 0°C to r.t.; (vi) H2, 10% Pd●C, dichloromethane, methanol, r.t..
