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Reagents and conditions: (a) (i) l-amino acid (di)amyl ester HCl salts 9a–g (see the Supporting Information), PhOH, 2,2′-dithiodipyridine, PPh3, Et3N, Pyr, 60 °C, 12 h; (ii) TCA (6% in DCM), rt, 2 h, 28–35% over two steps.
