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Synthesis of N‐Teoc‐6‐benzyloxy‐l‐tryptophan (8) by dynamic kinetic resolution: a) l‐serine, Ac2O, AcOH, 75 °C, 2 h, 82 %; b) 40 % NaOH, MeOH/H2O, c) chiral ligand 16, Ni(NO3)2 6H2O, MeOH, reflux, 16 h, 84 % over two steps, d) 6 m HCl, MeOH, 70 °C, 2 h, e) TeocOSu, Et3N, DMF, 60 °C, 4 d, quant.
