Methanol → racemic (2'S,3S,4'R)-6-chloro-2'-(3-chlorophenyl)-4'-(5-fluoro-2-methyl-phenyl)-2,3-dihydro-2,6'-dioxo spiro[indole-3,3'-piperidine]-1-carboxylic acid ethyl ester

HRID 1728077Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]=[N:9][C:10]([O:12][Si](C)(C)C)=[CH2:11])[CH:5]=[CH:6][CH:7]=1.[CH2:17]([O:19][C:20]([N:22]1[C:30]2[C:25](=[CH:26][CH:27]=[C:28]([Cl:31])[CH:29]=2)/[C:24](=[CH:32]/[C:33]2[CH:38]=[C:37]([F:39])[CH:36]=[CH:35][C:34]=2[CH3:40])/[C:23]1=[O:41])=[O:21])[CH3:18].CO>C1(C)C=CC=CC=1>[CH2:17]([O:19][C:20]([N:22]1[C:30]2[C:25](=[CH:26][CH:27]=[C:28]([Cl:31])[CH:29]=2)[C:24]2([CH:32]([C:33]3[CH:38]=[C:37]([F:39])[CH:36]=[CH:35][C:34]=3[CH3:40])[CH2:12][C:10](=[O:11])[NH:9][CH:8]2[C:4]2[CH:5]=[CH:6][CH:7]=[C:2]([Cl:1])[CH:3]=2)[C:23]1=[O:41])=[O:21])[CH3:18]

Participants

Conditions

Temperature: 135 °C

Procedure

To a toluene (15 ml) solution of 1-(3-chlorophenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene prepared in example 1b in toluene (30 ml) was added E/Z-6-chloro-3-(5-fluoro-2-methyl-benzylidene)-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester (0.16 g, 0.45 mmol) prepared in example 145b. The reaction tube was sealed and heated by microwave irradiation at 135° C. for 35 min. After the solution was cooled to room temperature, methanol (25 mL) was added, and then the mixture was concentrated. The residue was purified by chromatography (EtOAc:CH2Cl2=1:3) to give racemic (2′S,3S,4′R)-6-chloro-2′-(3-chlorophenyl)-4′-(5-fluoro-2-methyl-phenyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid ethyl ester as a yellow oil (Yield 200 mg, 82%).

Workup

customThe reaction tube was sealed
temperatureAfter the solution was cooled to room temperature
concentrationthe mixture was concentrated
customThe residue was purified by chromatography (EtOAc:CH2Cl2=1:3)

Sources & evidence

ORD record: ord-49dc17061ef44e92b9c2b9d093b34ebb
Source dataset: uspto-grants-2009_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07495007B2

Reaction notes

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