[CH3:1][C:2]([SH:5])([CH3:4])[CH3:3].[F:6][C:7]1[CH:12]=[CH:11][CH:10]=[C:9](F)[C:8]=1[C:14]1[O:15][CH2:16][C:17]([CH3:20])([CH3:19])[N:18]=1.[H-].[Na+]>C1COCC1>[F:6][C:7]1[CH:12]=[CH:11][CH:10]=[C:9]([S:5][C:2]([CH3:4])([CH3:3])[CH3:1])[C:8]=1[C:14]1[O:15][CH2:16][C:17]([CH3:20])([CH3:19])[N:18]=1A mixture of 2-methyl-2-propanethiol (2.7 g, 30 mmol), the compound of example g (3.17 g, 15 mmol), and NaH (0.79 g, 33 mmol) in THF (100 mL) was stirred at RT for 1 d, then at reflux for 1 d. This was then quenched with sat aq NaHCO3 (50 mL) and extracted with EtOAc (3×50 mL). The combined organic extracts were dried (MgSO4), concentrated, ard purified by HPLC with 1:4 EtOAc/hexanes to afford 3.5 g of 2-[2-fluoro-6-(1,1-dimethylethylthio)phenyl]-4,4-dimethyl-2-oxazoline as a yellow oil, an 83% yield.
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