“…Recrystallization was carried out using hexanes/CH 2Cl2 (9:1, v/v): 173 mg, 61% yield; mp 27 107-109°C (lit. 16 3,161.3,155.1,87.2,79.6,63.6,55.7,52.7,52.3,40.6,33.5,28.5,25.8,24.1,12.2,10.9;IR (neat) (()-Methyl 3-(1-Acetylamino-2-ethylbutyl)-4-tert-butoxycarbonylamino-2-hydroxycyclopentanecarboxylate (18). To a solution of 17 (106 mg, 0.3 mmol) in MeOH (10 mL) were added concd HCl (29.7 µL, 0.3 mmol) and PtO 2 (10.2 mg, 0.045 mmol).…”