A solution of oxalyl chloride (0.4 ml) in acetonitrile (0.4 ml) is added dropwise to a solution of 1 ml of DMF and 2.4 ml of acetonitrile. The mixture is stirred (mechanically) for 15 minutes at -20° and a precipitate separates. Powdered 6-acetoxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (1.169 g, 4 mmol) is added, the mixture is stirred 20 minutes at -20°, 20 minutes at 0° and then is recooled to -20°. A solution of 1.165 g (4 mmol) of N-(2-hydroxyethyl)-N-methyl-[2,6-bis(1-pyrrolidinyl)]-4-pyrimidinamine in 1 ml of pyridine and a total of 4 ml of acetonitrile is added. The mixture is allowed to warm and stand overnight at 20°-25° and then is diluted with methylene chloride. The solution is washed with water, aqueous potassium bicarbonate and water, then dried and concentrated to give a foam. Chromatography on silica gel and elution with acetone/methylene chloride (10/90) gives the title compound. NMR 4.70, 4.27, 3.9-3.2, 2.85, 2.58, 2.32, 2.17, 2.16, 2.02, 1.9 and 1.58 δ; m.p. 69.5°-76°.
