Water → (1R,2S)-1'-(2-bromoethyl)-2-(4-chlorophenyl)spiro[cyclopropane-1,3'-indolin]-2'-one

HRID 1805334Notes

Reaction equation

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]2[C@:10]3([C:18]4[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=4)[NH:12][C:11]3=[O:19])[CH2:9]2)=[CH:4][CH:3]=1.C[Si]([N-][Si](C)(C)C)(C)C.[K+].[CH2:30](Br)[CH2:31][Br:32].O>CN(C=O)C>[Br:32][CH2:31][CH2:30][N:12]1[C:13]2[C:18](=[CH:17][CH:16]=[CH:15][CH:14]=2)[C@:10]2([CH2:9][C@H:8]2[C:5]2[CH:4]=[CH:3][C:2]([Cl:1])=[CH:7][CH:6]=2)[C:11]1=[O:19]

Participants

Conditions

Temperature: 50 °C

Procedure

To a solution of (1R,2S) and (1S,2R)-2-(4-chlorophenyl)spiro[cyclopropane-1,3′-indolin]-2′-one (173 mg, 0.64 m mol) in DMF (2 mL) was added KHMDS (0.5 M, 1.4 mL) dropwise at room temperature. The mixture was stirred for half an hour before adding ethylene dibromide (300 mg, 1.6 mmol). The mixture was warmed to 50° C. and stirred at that temperature for 14 hours. The mixture was poured into water, extracted with ethyl acetate (3×15 mL), dried and concentrated under reduced pressure. The residue was purified by flash column chromatography (gradient elution, 5-10% ethyl acetate in petroleum ether) to give the title compound as white solid (98 mg, 41%). LC/MS m/e calcd. for C18H15BrClNO: 375, observed (M+H)+: 376.

Workup

stirringstirred at that temperature for 14 hours
extractionextracted with ethyl acetate (3×15 mL)
customdried
concentrationconcentrated under reduced pressure
customThe residue was purified by flash column chromatography (gradient elution, 5-10% ethyl acetate in petroleum ether)

Sources & evidence

ORD record: ord-747f936876a84c258d7fb16c280ac833
Source dataset: uspto-grants-2013_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08354443B2

Reaction notes

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