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Reagents and conditions: (i) Boc-l-Val or Boc-O-benzyl-l-Ser or Boc-l-Thr, DCC, HOBt, Et3N, DMAP, EtOAc, rt; (ii) TFA/DCM (1:5), rt; (iii) Boc-Gly, DCC, HOBt, Et3N, DMAP, EtOAc, rt; (iv) RCOOH, EDC, HOBt, DIPEA, DMAP, DMF, rt; (v) H2, Pd/C, CH3COOH, rt.
