Sodium hydride → 1-(diphenylmethyl)-5-fluoro-1H-indole-2,3-dione

HRID 2384965Notes

Reaction equation

[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][C:6](=[O:11])[C:5]2=[O:12].[H-].[Na+].Br[CH:16]([C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>CN(C)C=O.C(OCC)(=O)C>[C:17]1([CH:16]([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[N:7]2[C:8]3[C:4](=[CH:3][C:2]([F:1])=[CH:10][CH:9]=3)[C:5](=[O:12])[C:6]2=[O:11])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred solution of 5-fluoroisatin (6.00 g, 36.3 mmol) in N,N-dimethylformamide (50 mL) was added sodium hydride (1.60 g, 40.0 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 1 h followed by the addition of bromodiphenylmethane (10.0 g, 38.0 mmol). The mixture was stirred at 60° C. for 7 h, diluted with ethyl acetate, washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness, the residue was recrystallized from ethyl acetate and hexanes to give 1-(diphenylmethyl)-5-fluoro-1H-indole-2,3-dione (6.30 g, 52%): 1H NMR (300 MHz, CDCl3) 7.39-7.27 (m, 11H), 7.04-6.97 (m, 2H), 6.46-6.42 (m, 1H); MS (ES+) m/z 354.2 (M+23).

Workup

stirringThe mixture was stirred at 60° C. for 7 h
washwashed with water and brine
dry with materialdried over anhydrous sodium sulfate
filtrationfiltered
concentrationThe filtrate was concentrated in vacuo to dryness
customthe residue was recrystallized from ethyl acetate and hexanes

Sources & evidence

ORD record: ord-0a764b6d3bf64610937a52f4715efaf6
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08263606B2

Reaction notes

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