反应详情

49 Parts of N-cyclohexylhydroxylamine hydrochloride is dissolved in 400 parts of dichloromethane; at room temperature a solution of 50.4 parts of sodium hydrogen carbonate in 500 parts of water and subsequently 51.6 parts of 2,4,5-trimethylfuran- 3-carboxylic chloride are added to the mixture. After the mixture has been stirred for 2 hours the dichloromethane phase is separated, dried over anhydrous sodium sulfate and evaporated. There is obtained 75 parts of N-cyclohexyl-2,4,5-trimethylfuran-3-hydroxamic acid in the form of an oil. This oil is dissolved in 300 parts of dichloromethane. To this solution there is added 36 parts of sodium hydroxide in 200 parts of water and 75.6 parts of dimethyl sulfate and the whole is stirred for 2 hours. The dichloromethane phase is then separated, washed with water until neutral, dried over anhydrous sodium sulfate and evaporated. Upon distillation of the residue there is obtained 52 parts of O-methyl-N-cyclohexyl-2,4,5-trimethylfuran-3-hydroxamic acid having a boiling point at 0.3 mm Hg of 128° to 130° C and the refractive index nD25 : 1.5021. ##SPC11##

1. customis separated
2. dry with materialdried over anhydrous sodium sulfate
3. customevaporated