[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]([NH:10][CH2:11][CH2:12][C:13]([C:15]2[CH:20]=[CH:19][C:18]([F:21])=[CH:17][CH:16]=2)=O)[CH3:9])=[CH:4][CH:3]=1.[CH3:22][C:23]([S@:26]([NH2:28])=[O:27])([CH3:25])[CH3:24]>C1COCC1.[Cl-].[Na+].O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]([NH:10][CH2:11][CH2:12][C:13](=[N:28][S@@:26]([C:23]([CH3:25])([CH3:24])[CH3:22])=[O:27])[C:15]2[CH:20]=[CH:19][C:18]([F:21])=[CH:17][CH:16]=2)[CH3:9])=[CH:4][CH:3]=1A mixture of (S)-3-(1-(4-bromophenyl)ethylamino)-1-(4-fluorophenyl)propan-1-one (14.5 g, 0.04 mol), (R)-2-methylpropane-2-sulfinamide (5.5 g, 0.046 mol), and Ti(OEt)4 (18 g, 0.08 mmol) in THF (150 mL) was heated to reflux overnight. The mixture was treated with brine, and the precipitate was filtered. The filtrate was concentrated to give (R)—N-(3-((1S)-1-(4-bromophenyl)ethylamino)-1-(4-fluorophenyl)propylidene)-2-methylpropane-2-sulfinamide (13.3 g, 59%), which was used for the next step without purification.
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