Kinetic Studies on the Methylation of Thiopurines

Abstract
Both 6‐mercaptopurine and 6‐thioxanthine, when treated with methyl iodide in dimethylformamide, undergo a two‐step reaction, i.e. first methylation at the sulphur atom, followed by alkylation at N‐3. Reaction; at the sulphur atom of 3‐methyl‐6‐purinethione proceeds 1350 times faster than in 6‐mercaptopurine.

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