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0 °C

To a solution of (E)-3-(3,5-difluoro-4-phenoxyphenyl)-2-methylprop-2-en-1-ol (Intermediate 93.1) (410 mg, 1.49 mmol) in dry toluene (7.45 mL) under N2 was added PPh3 and phthalimide. The resulting solution was cooled to 0° C. and diethyl azodicarboxylate (DEAD, 0.748 mL) was added dropwise over several minutes. The reaction was allowed to warm to room temperature and stirred overnight. After diluting with EtOAc (20 mL), the organic layer was washed with water (2×30 mL), brine (30 mL) and dried over Na2SO4. After removal of solvent, the resulting residue was applied to a silica gel column (15% EtOAc in hexanes) to yield 385 mg of the title compound (63%) as an oil.

1. temperatureto warm to room temperature
2. washthe organic layer was washed with water (2×30 mL), brine (30 mL)
3. dry with materialdried over Na2SO4
4. customAfter removal of solvent