Water → Diethyl 4-(6-bromo-4-methylthioquinazolin-2-yl)benzyl(thio)phosphonate

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Reaction Steps

A 0.60 g quantity of the compound obtained in Example 52 was dissolved in 10 ml of THF, and 0.2 ml of triethylamine and 0.1 ml of methyl iodide were serially added thereto with stirring at room temperature. The stirring was continued at room temperature for 30 minutes. After adding 30 ml of water, the reaction mixture was extracted with chloroform. The chloroform layer was washed with water, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: chloroform: n-hexane=2:1) and recrystallized from diethyl ether-n-hexane to provide 0.43 g of the objective compound as yellow crystals (melting point: 126°-127° C.).

Provenance & Evidence