Methyl iodide → 4,5-Dihydro-4-methyl-3-methylthio-1-phenyl-1H-2,4-benzodiazepine

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A solution of 8 g (30 mmol) of the thione of Example 152 and 2.7 mL (44 mmol) of methyl iodide in 100 mL of ethanol was refluxed two hours, cooled, and the hydriodide of the product filtered off. The salt was partitioned between methylene chloride and aqueous sodium bicarbonate, the organic layer dried over magnesium sulfate, and stripped. The residue was dissolved in ethanol and 2.7 g of methanesulfonic acid was added followed by ether. The resulting precipitate was filtered off and recrystallized from ethanol to yield 5.2 g of product as the methanesulfonate salt, mp 195-196.

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