Water → Tert-butyl 4-[2-(1-oxa-6-azaspiro[2,5]octan-6-yl)-2-oxoethyl]piperazine-1-carboxylate

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Reaction Steps

Trimethylsulfoxonium iodide (2.02 g, 9.20 mmol) was gradually added to a suspension of sodium hydride (385 mg, 9.64 mmol) in dimethylsulfoxide (50 ml), and the resultant mixture was stirred at room temperature for 1 hour. To which tert-butyl 4-[2-oxo-2-(4-oxopiperidin-1-yl)ethyl]piperazine-1-carboxylate (2.85 g, 8.76 mmol) in DMSO (10 ml) was added, and the mixture was stirred at room temperature for 2 hours, and stirred at 55° C. for 1 hour. The reaction mixture was poured into iced water, and extracted with diethyl ether. The organic phase was washed with a saturated saline solution, dried over magnesium sulfate, and filtered. The resultant filtrate was concentrated under a reduced pressure to afford tert-butyl 4-[2-(1-oxa-6-azaspiro[2,5]octan-6-yl)-2-oxoethyl]piperazine-1-carboxylate (2.97 g, yield 99%) as a white solid.

Provenance & Evidence