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温度

0 °C

To a 0° C. solution of 250 g (2.68 mole) of aniline and 233.2 g (2.95 mole) of pyridine in 1.25 L of methylene chloride and 319.6 g (2.79 mole) of methanesulfonyl chloride dropwise. Stir the resulting solution at 0° C. for about 30 minutes then warm to ambient temperature for about 16 hours. Extract the mixture with 2N aqueous sodium hydroxide (4×1 L). Combine the aqueous extracts and wash with 1 L of methylene chloride. Cool the aqueous layer to about 0° C. and acidify with concentrated hydrochloric acid until about pH 1. Collect the precipitate and dry to give the title compound.

1. customTo a 0° C.
2. temperaturethen warm to ambient temperature for about 16 hours
3. extractionExtract the mixture with 2N aqueous sodium hydroxide (4×1 L)
4. washCombine the aqueous extracts and wash with 1 L of methylene chloride
5. temperatureCool the aqueous layer to about 0° C.
6. customCollect the precipitate
7. customdry