Dimethyl Sulfoxide → tert-Butyl 4-fluoro-5-oxoazepane-1-carboxylate

Temperature

125 °C

To a 500 mL flask containing the product from Step A (23.5 g, 77.5 mmol) was added DMSO (160 mL) followed by H2O (6.98 mL, 387 mmol) and then LiCl (16.4 g, 387 mmol). The mixture was warmed to 125° C. and stirred for 5 hours. The resulting dark mixture was then cooled to ambient temperature and diluted with EtOAc (500 mL) and washed with a saturated aqueous NaHCO3:water (1:1, 3×250 mL). The combined aqueous phase was washed with EtOAc (100 mL) and the combined organic phases were washed with brine and dried over Na2SO4, filtered and concentrated. The crude oil was purified by column chromatography (10 to 30% EtOAc/hexanes) to provide 10.0 g (56%) of the desired product as a light golden oil.

1. temperatureThe resulting dark mixture was then cooled to ambient temperature
2. washwashed with a saturated aqueous NaHCO3:water (1:1, 3×250 mL)
3. washThe combined aqueous phase was washed with EtOAc (100 mL)
4. washthe combined organic phases were washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe crude oil was purified by column chromatography (10 to 30% EtOAc/hexanes)

ORD record

ord-b01934af30f246859fb374ee9046dfd2

Source dataset

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08575145B2