Sodium hydride → 4-chloro-1-(diphenylmethyl)-1H-indole-2,3-dione

HRID 1407378Notes

Reaction equation

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

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred solution of 4-chloroisatin (9.10 g, 50.0 mmol) in N,N-dimethylformamide (100 mL) was added sodium hydride (2.20 g, 55.0 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 1 h, followed by the addition of bromodiphenylmethane (14.80 g, 56.8 mmol). The mixture was stirred at ambient temperature for 20 h, diluted with ethyl acetate, washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo. The residue was recrystallized from diethyl ether and hexanes to afford 4-chloro-1-(diphenylmethyl)-1H-indole-2,3-dione (14.20 g, 81%): 1H NMR (300 MHz, CDCl3) δ7.37-7.17 (m, 11H), 6.98-6.95 (m, 2H), 6.42 (d, J=9.0 Hz, 1H); MS (ES+) m/z 369.9 (M+23), 371.9 (M+1).

Workup

stirringThe mixture was stirred at ambient temperature for 20 h
washwashed with water and brine
dry with materialdried over anhydrous sodium sulfate
filtrationfiltered
concentrationThe filtrate was concentrated in vacuo
customThe residue was recrystallized from diethyl ether and hexanes

Sources & evidence

ORD record: ord-3960b87b73b14458af0e04c6ab3d0586
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08916580B2

Reaction notes

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