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l-Methyl-3-[2-(purin-6-yIthio)ethyl]urea (XI). Method C¡ªA solution of commercial 2-aminoethanethiol hydrochloride(13.0 g., 0.0116 mole) in methanol (90 ml.) was treated with asolution of sodium methoxide (5.5 g., 0.10 mole) in methanol(110 ml.), a slight excess of the hydrochloride being requisite.The solvent was removed under reduced pressure with care being taken not to volatilize the free base. The residue was extracted with two 50ml. portions of warm chloroform, and the chloroform extract was filtered, cooled (0-5¡ã), and treated with methyl isocyanate18 (6.6 ml., 0.10 mole). After 15 min. at room temperature, the solvent was removed under reduced pressure leaving crude l-(2-mercaptoethyl)-3-methylurea (13.0 g.,93%) as a pale yellow oil. A well stirred mixture of crudel-(2-mercaptoethyl)-3-methylurea,6-chloropurine (13.8 g., 0.0895 mole), potassium carbonate (12.4 g., 0.0898 mole), and N,N-dimethylformamide(50 ml.) was heated at 80-90¡ã for 2 hr. The reaction mixture was evaporated to dryness in vacuo, and the semisolid residue was extracted with three 50ml. portions of hot ethanol. Concentration and cooling of the combined extracts produced two crops of crude XI, m.p. 230¡ã, totaling 2.95 g. Additional product (3.4 g.,m.p. 232¡ã) was obtained from the mother liquor by evaporation to dryness in vacuo and precipitation of the residual solid from water solution (30 ml.) at pH 7. Recrystallization of the combined crops from ethanol and then from water afforded 5.33 g.(23.5%) |
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