Sodium hydride → 1-Benzhydryl-3-(methoxymethylene)azetidine

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To a suspension of sodium hydride (60% mineral oil dispersion, 0.10 g, 2.3 mmol) in anhydrous tetrahydrofuran (30 mL) was added (methyoxymethyl)triphenylphosphonium chloride (0.80 g, 2.3 mmol) at 0° C. The mixture was stirred at 0° C. for 40 minutes, then a solution of 1-benzhydryl-azetidin-3-one (0.50 g, 2.1 mmol) in tetrahydrofuran was introduced at 0° C. The resulting mixture was refluxed for 2 hours. The reaction was quenched with water and extracted with methylene chloride (3×50 mL). The organic layer was washed with water (3×50 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuum. The crude oil was column chromatographed on silica gel (20% ethyl acetate-hexane). The product-containing fractions were concentrated under vacuum to give 0.29 g (52%) of the title compound as a light yellow solid, m.p. 56-58° C.

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