Methanol → (2R,3R)-tert-butyl 2-((tert-butyldimethylsilyloxy)methyl)-3-(4-(trifluoromethyl)phenyl)aziridine-1-carboxylate

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To a suspension of 4.0 g sodium hydride (60% dispersion in mineral oil) in 50 mL THF at 0° C. was added a solution (1R,2R)-1-((tert-butoxycarbonyl)amino)-3-(tert-butyldimethylsilyloxy)-1-(4-(trifluoromethyl)phenyl)-propan-2-yl methanesulfonate (13.5 g, 25.6 mmol) in 60 mL THF. The reaction progress was monitored by TLC (20% EtOAc in hexane). When no more starting material could be detected, 4 grams of MeOH was added to the mixture to remove the excess sodium hydride. The solvent was then removed at reduced pressure, and 200 mL of distilled water was added to the residue. The aqueous phase was extracted (3×150 mL) with EtOAc. The combined organic layers were washed with brine and dried over sodium sulfate. The crude product was then chromatographed eluting with 3% EtOAc in hexane. After removing the solvent, the product was obtained as a colorless oil (6.5 g, yield=58%). 1H NMR (400 MHz, CD3OD) o ppm 0.14-0.18 (m, 6 H) 0.95-0.98 (m, 9 H) 1.46 (s, 9 H) 2.78 (q, J=2.80 Hz, 1H) 3.64 (d, J=2.93 Hz, 1H) 4.11 (ddd, J=18.19, 11.93, 2.54 Hz, 2H) 7.48 (d, J=8.22 Hz, 2H) 7.66 (d, J=8.02 Hz, 2H).

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