Bromine → (S)-6-(4-bromo-3-cyano-1-cyclobutyl-6 (difluoromethoxy)-5-fluoro-1H-indol-2-yl)-N-(1,1,1-trifluoropropan-2-yl)pyridine-3-sulfonamide

HRID 1028027Notes

Reaction equation

[C:1]([C:3]1[C:11]2[C:6](=[CH:7][C:8]([O:13][CH:14]([F:16])[F:15])=[C:9]([F:12])[CH:10]=2)[N:5]([CH:17]2[CH2:20][CH2:19][CH2:18]2)[C:4]=1[C:21]1[N:26]=[CH:25][C:24]([S:27]([NH:30][C@@H:31]([CH3:36])[C:32]([F:35])([F:34])[F:33])(=[O:29])=[O:28])=[CH:23][CH:22]=1)#[N:2].[Br:37]Br.OS([O-])=O.[Na+]>[Fe].ClCCCl>[Br:37][C:10]1[C:9]([F:12])=[C:8]([O:13][CH:14]([F:15])[F:16])[CH:7]=[C:6]2[C:11]=1[C:3]([C:1]#[N:2])=[C:4]([C:21]1[N:26]=[CH:25][C:24]([S:27]([NH:30][C@@H:31]([CH3:36])[C:32]([F:34])([F:35])[F:33])(=[O:28])=[O:29])=[CH:23][CH:22]=1)[N:5]2[CH:17]1[CH2:18][CH2:19][CH2:20]1

Participants

Conditions

Temperature: 50 °C

Procedure

A mixture of (S)-6-(3-cyano-1-cyclobutyl-6-(difluoromethoxy)-5-fluoro-1H-indol-2-yl)-N-(1,1,1-trifluoropropan-2-yl)pyridine-3-sulfonamide (500 mg, 0.94 mmol), Fe powder (700 mg, 13 mmol), Br2 (300 μL, 5.9 mmol), and 1,2-dichloroethane (3 mL) was heated at 50° C. for 3 hours. The reaction mixture was then poured into aq. NaHSO3 solution. This was extracted into CH2Cl2. The organic layer was dried over MgSO4 and filtered, and the filtrate was concentrated under vacuum. Purification by silica gel chromatography (ethyl acetate in hexanes, 20% to 30%) yielded (S)-6-(4-bromo-3-cyano-1-cyclobutyl-6 (difluoromethoxy)-5-fluoro-1H-indol-2-yl)-N-(1,1,1-trifluoropropan-2-yl)pyridine-3-sulfonamide (266 mg, 46%) as a white solid.

Workup

extractionThis was extracted into CH2Cl2
dry with materialThe organic layer was dried over MgSO4
filtrationfiltered
concentrationthe filtrate was concentrated under vacuum
customPurification by silica gel chromatography (ethyl acetate in hexanes, 20% to 30%)

Sources & evidence

ORD record: ord-7dc2258f4f0542ec90a444b0eaa2e784
Source dataset: uspto-grants-2014_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08735414B2

Reaction notes

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