3-Oxo-azetidine-1-carboxylic acid tert-butyl ester → tert-Butyl 3-[(2-methylpropane-2-sulfinyl)imino]azetidine-1-carboxylate

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A mixture of tert-butyl 3-oxoazetidine-1-carboxylate (4 g, 23.37 mmol), 2-methylpropane-2-sulfinamide (3.12 g, 25.7 mmol) and tetraethoxytitanium (10.66 g, 46.7 mmol) in THF (40 ml) in a 20 ml sealed tube was stirred at 70° C. overnight. The reaction mixture was cooled to room temperature, quenched with water and filtered through a bed of Celite. The solid material was washed with ethyl acetate. The organic layer was separated, dried over Na2SO4, filtered and concentrated to obtain a crude mixture. The crude product was then purified by column chromatography (20% EtOAc in Hexane) to afford tert-butyl 3-(tert-butylsulfinylimino)azetidine-1-carboxylate Yield: 1.5 g (24%). 1H NMR (400 MHz, CDCl3): δ 5.15-4.94 (m, 1H), 4.75 (m, 1H), 4.68 (s, 2H), 1.45 (s, 9H), 1.27 (s, 9H).

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