反应详情

A mixture of trans-4-[2-(dimethyl-hydrazono)-cyclohexanecarbonyl]-cyclohexanecarboxylic acid methyl ester (0.95 g, 3.1 mmol), sodium acetate (0.28 g, 3.4 mmol) and hydroxylamine hydrochloride (0.24 g, 3.4 mmol) in methanol (15 ml) was stirred at room temperature for 16 h. The reaction mixture was partitioned between ethyl acetate (100 ml) and water (50 ml). The layers were separated. The aqueous layer was extracted with two 100-ml portions of ethyl acetate. The combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. The residue (0.88 g) was dissolved in toluene (15 ml). After addition of a catalytic amount of toluene-4-sulfonic acid monohydrate the mixture was heated at reflux for 3 h. The solvent was evaporated. Purification with n-heptane/ethyl acetate as eluent gave the title compound (0.58 g, 72%) with a regioisomeric purity of approx. 90% according to 13C-NMR. MS m/e: 264 ([M+H]+)

1. customThe reaction mixture was partitioned between ethyl acetate (100 ml) and water (50 ml)
2. customThe layers were separated
3. extractionThe aqueous layer was extracted with two 100-ml portions of ethyl acetate
4. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo
6. dissolutionThe residue (0.88 g) was dissolved in toluene (15 ml)
7. additionAfter addition of a catalytic amount of toluene-4-sulfonic acid monohydrate the mixture
8. temperaturewas heated
9. temperatureat reflux for 3 h
10. customThe solvent was evaporated
11. customPurification with n-heptane/ethyl acetate as eluent