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Reagents and conditions. (a) N-(3-(dimethylamino)propyl)-N′-ethylcarbodiimide, N-methylmorpholine, 1-hydroxybenzotriazole hydrate, 20 °C; (b) H2 (1 bar), 10% Pd/C, EtOH, 20 °C; (c) 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium-3-oxide hexafluorophosphate, Et3N, CH2Cl2, room temp.; (d) NaOH(aq), EtOH, 20 °C; (e) LiOH, THF/H2O, 20 °C. All compounds are racemic unless indicated in the text.
