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Methyl magnesium iodide (3M in diethyl ether, 1.4 mL, 4.2 mmol) was added dropwise to an ice-cold solution of 1-(diphenylmethyl)-3-azetidinone (1 g, 4.20 mmol) in diethyl ether (25 mL) and the mixture was stirred for 1 hour at 0° C. The crude reaction mixture was then purified directly by column chromatography on silica gel, eluting with dichloromethane:methanol, 100:0 to 95:5, to afford the title compound the title compound as a pale yellow oil in 68% yield, 730 mg. 1H NMR (CDCl3, 400 MHz) δ: 1.54 (s, 3H), 3.02 (m, 2H), 3.22 (m, 2H), 4.39 (s, 1H), 7.20 (m, 4H), 7.26 (m, 4H), 7.41 (m, 2H); LRMS ESI+ m/z 254 [M+H]+

1. customThe crude reaction mixture
2. customwas then purified directly by column chromatography on silica gel
3. washeluting with dichloromethane