Water → N-(2-Chloroethyl)-N'-beta-D-glucopyranosyl-N-nitrosourea

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A solution of 0.60 g of 1-(2-chloroethyl)-3-(β-D-glucopyranosyl)urea in 15 ml of 99% formic acid was admixed with 282 mg of sodium nitrite under ice-cooling and stirring. The mixture was stirred for 1 hour under ice-cooling to effect the nitrosation. The reaction mixture, after addition of 15 ml of cold water thereto, was ice-cooled for 30 minutes and then treated with 5 ml of Amberlite IR-120 (H+ form) for the removal of sodium cation. The reaction mixture so treated was concentrated to dryness below 30° C. by distilling off the solvent under a reduced pressure. The residue was taken up into a small volume of n-propanol and the solution was admixed with a volume of petroleum ether to give a precipitate. The precipitate which deposited was collected by filtration and then dried in a desiccator under vacuum, affording 0.65 g of the titled compound as an amorphous solid of pale yellow color. Yield 92%. mp. 85° C. (decomposition). [α]D16 -14° (c 0.5, methanol).

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