Lawesson's reagent → tert-Butyl (3R,6S)-6-(2,3-difluorophenyl)-2-thioxoazepan-3-ylcarbamate

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Lawesson's reagent [2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide] (2.90 g, 7.18 mmol) was added to a suspension of tert-butyl (3R,6S)-6-(2,3-difluorophenyl)-2-oxoazepan-3-ylcarbamate (4.79 g, 14.1 mmol, described in Intermediate 4) in toluene (250 mL) and the mixture was heated to 90° C. After 1 h, the reaction was allowed to cool to ambient temperature and concentrated under reduced pressure. The residue was partially purified by silica gel chromatography, eluting with a gradient of CH2Cl2:EtOAc—100:0 to 85:15.

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