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linglin0409

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3-[2-(9-Butyl-9H-purin-6-yl thio)ethyl]-l-methylurea (XII).Method D.¡ªA well stirred mixture of 9-butyl-9H-purine-6(lH)-th ione19 (10.0 g., 48.0 mmoles), potassium carbonate (6.9 g.,50 mmole), and N,N-dimethylformamide (70 ml.) was heated to80¡ã, and
l-(2-chloroethyl)-3-methylurea (6.84 g., 50.0 mmoles)was added in small portions. After 2 hr. at 80-90¡ã, the mixture was cooled and diluted with water (250 ml.). The white solid that formed was washed with cold water and dried in vacuo at 100¡ã; vield of XII, 10.6 g. (72%);

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