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0 °C

A mixture of 13 (36 mg, 0.071 mmol) in 0.35 mL of dry THF was cooled to 0° C. A 26 μL aliquot of a 3 M solution of phenyl magnesium bromide in ether (0.078 mmol) was added to the mixture and the reaction was allowed to warm up to room temperature. The reaction was worked up in 30 minutes when the reaction was complete as indicated by TLC. The mixture was diluted with EtOAc and washed with water. The product 14 was purified by column chromatography using 20% EtOAc-Hex solvent system to provide 33 mg (80%) of the product as a solid. 1H NMR (300 MHz, CDCl3) δ 1.20 (s, 18H), 1.52-1.68 (m, 3H), 2.95 (s, 1H), 3.93 (s, 3H), 4.08 (d, 1H, J=15 Hz), 4.77 (d, 1H, J=15 Hz), 6.85 (t, 2H, J=9Hz), 7.19-7.25 (m, 2H), 7.25-7.35 (m, 3H), 7.39-7.49 (m, 3H), 8.26 (d, 1H, J=8 Hz), 8.84 (br d, 1H, J=4 Hz); 19F NMR (282.6 MHz, CDCl3) δ −76.2, 60.7; EI MS (m/z) 587.5 [MH+], 609.4 [M+Na].

1. temperatureto warm up to room temperature
2. washwashed with water
3. customThe product 14 was purified by column chromatography