Ammonium formate → 4-Oxa-1-azaspiro[5.5]undecan-2-one

Participants

Reaction Conditions

Reaction Steps

Under the nitrogen gas atmosphere, ammonium formate (5.75 g, 91.1 mmol) and 10% Pd-carbon (4.5 mg) was added in the methanol (90 mL) solution of (1-nitro-cyclohexylmethoxy)-ethyl acetate (4.5 g, 18.2 mmol) which had been obtained in 2), and the mixture was heated and stirred at 50° C. over-night. After that, the mixture was filtered with Celite, the filtrate was concentrated under reduced pressure, the residue was refined with silica gel column chromatography (Highflash 3L, manufactured by Yamazen Corporation, and the mixtures of hexane and ethyl acetate of 5:1, 1:1, and 1:2 in mixing ratio), and an orange-colored crystal of 4-oxa-1-aza-spiro[5.5]-undecan-2-one (1.67 g, 54%) was obtained.

Provenance & Evidence