反应详情

28.3 ml (0.3 mol) acetic acid anhydride are mixed with 375 ml acetonitrile, cooled in an ice-bath to 0°-5° C. and 12.6 ml (0.3 mol) 100% nitric acid added dropwise. After 30 minutes, 15.7 g (0.1 mol) solid trans-N-acetyl-4-hydroxycyclohexylamine are added thereto with stirring and cooling at 0°-5° C. The reaction mixture is further stirred for 3 h at 0°-5° C. and subsequently allowed to flow carefully into a solution of 150 g (18 mol) sodium hydrogen carbonate in 500 ml ice water. After extraction with ethyl acetate, drying of the organic phase with sodium sulphate and distilling off in a vacuum, there remain 17.8 g of crude product. After recrystallisation from ethyl acetate, there are obtained 10.3 g of the title compound of the m.p. 146°-148° C., i.e. 50% of theory.

1. temperaturecooled in an ice-bath to 0°-5° C.
2. temperaturecooling at 0°-5° C
3. stirringThe reaction mixture is further stirred for 3 h at 0°-5° C.
4. extractionAfter extraction with ethyl acetate
5. dry with materialdrying of the organic phase with sodium sulphate
6. distillationdistilling off in a vacuum, there remain 17.8 g of crude product
7. customAfter recrystallisation from ethyl acetate, there