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A mixture of 4.2 g (15.03 mmol) of 2-cyano-3-(4-fluoro-2-methoxyphenyl)-3-methylbutyric acid methyl ester and 2.5 g (42.77 mmol) of sodium chloride in 40 mL of DMSO with 2 mL of water was warmed to reflux. Gas evolution was clearly evident early in the reaction. After 4 hours, the reaction was cooled and diluted with 100 mL of brine and extracted with four 75 mL portions of EtOAc. The combined organic layers were washed with six 50 mL portions of brine, dried over magnesium sulfate, filtered, and concentrated to afford an oil which solidified under vacuum. The tan solid was triturated with hexanes and collected by filtration to afford 2.52 g (81%) of 3-(4-fluoro-2-methoxyphenyl)-3-methylbutyronitrile, m.p. 80° C.-83° C.

1. temperaturewas warmed to reflux
2. customGas evolution was clearly evident early in the reaction
3. temperaturethe reaction was cooled
4. extractionextracted with four 75 mL portions of EtOAc
5. washThe combined organic layers were washed with six 50 mL portions of brine
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. customto afford an oil which
10. customThe tan solid was triturated with hexanes
11. filtrationcollected by filtration