1,8-Diazabicyclo(5.4.0)undec-7-ene → 6-allyl-3-((S)-3,3-dimethylbutan-2-yl)-6-(4-fluorophenyl)-1,3-oxazinan-2-one

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A mixture of 1-chloro-3-(4-fluorophenyl)hex-5-en-3-ol (500 mg, 2.19 mmol), (S)-3-isocyanato-2,2-dimethyl-butane (845 mg, 5.58 mmol), and DBU (681 mg, 5.9 mmol) in THF (10 mL) was heated to reflux for 25 h. The mixture was diluted with EtOAc and washed with 1 N aq HCl. The aqueous phase was extracted with EtOAc (3×). The combined organic phase was dried over Na2SO4. After the solvents were evaporated, the crude product was purified by column to give 6-allyl-3-((2S)-3,3-dimethylbutan-2-yl)-6-(4-fluorophenyl)-1,3-oxazinan-2-one (80 mg, crude).

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