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0 °C

tert-Butyl 3-(1,1-dimethylethylsulfinamido)-3-(pyrimidin-2-yl)azetidine-1-carboxylate (40 mg, 0.113 mmol) in MeOH (0.5 ml) in a 10 ml round-bottomed flask was cooled to 0° C. A solution of HCl in ether (0.141 ml, 0.564 mmol, 4 N) was added. The mixture was then stirred at 0° C. for 15 min and then concentrated at room temperature. The residue was triturated with hexane and diethyl ether. The resulting solid was allowed to settle and supernatant liquid was decanted. The solid obtained was dried under vacuo to afford tert-butyl 3-amino-3-(pyrimidin-2-yl)azetidine-1-carboxylate hydrochloride Yield: 28 mg (87%). 1H NMR (400 MHz, DMSO-d6): δ 9.08 (bs, 2H), 9.0 (d, J=4.8 Hz, 2H), 7.63 (t, J=4.8 Hz, 1H), 4.23-4.21 (m, 4H), 1.43 (s, 9H). LCMS: (ES+) m/z observed=151.2 (M+H)+ of 3-(pyrimidin-2-yl)azetidin-3-amine

1. concentrationconcentrated at room temperature
2. customThe residue was triturated with hexane and diethyl ether
3. customsupernatant liquid was decanted
4. customThe solid obtained
5. customwas dried under vacuo