反应详情

1.79 g (10 mmol) of 1-amino-1-deoxy-β-D-glucopyranose is dissolved (partially suspended) in 40 ml of anhydrous ethanol, and the solution is cooled to 0°-5° C. To this solution is added 2.2 g (50 mmol) of dry-ice little by little so as to convert the glucopyranose into its carbonic acid-addition salt. This acid-addition salt solution is then added dropwise to a solution prepared by dissolving 3.28 g (12 mmol) of o-nitrophenyl N-(2-chloroethyl)-N-nitrosocarbamate in a mixture of 40 ml anhydrous tetrahydrofuran and 10 ml benzene, while stirring, at 0°-5° C. over an hour. The resultant mixture is stirred further at 20°-25° C. for 2 hours, and the thus reacted solution is concentrated at 50° C. and below, under reduced pressure. The crystalline residue obtained is washed with anhydrous ethyl ether and then with acetone, dried under reduced pressure, and recrystallized from anhydrous isopropanol to give 2.72 g of 3-(β-D-glucopyranosyl)-1-(2 -chloroethyl)-1-nitrosourea. Yield 86.8%. mp 77°-78° C. (decomp.). [α]D25 -10.3° (C 1.0, water). Analysis for C9H16N3O7Cl (MW 313.69):

1. temperaturethe solution is cooled to 0°-5° C
2. additionThis acid-addition salt solution is then added dropwise to a solution
3. customprepared
4. concentrationthe thus reacted solution is concentrated at 50° C.
5. customThe crystalline residue obtained
6. washis washed with anhydrous ethyl ether
7. dry with materialwith acetone, dried under reduced pressure
8. customrecrystallized from anhydrous isopropanol