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

HRID 1727952Notes

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]=[CH:37][CH:36]=[C:35]([Cl:39])[CH:34]=2)/[C:23]1=[O:40])=[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]=[CH:37][CH:36]=[C:35]([Cl:39])[CH:34]=3)[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:40])=[O:21])[CH3:18]

Participants

Conditions

Temperature: 135 °C

Procedure

To a solution of 1-(3-chlorophenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene prepared in example 1b in toluene (20 mL) was added E/Z-6-chloro-3-(3-chloro-benzylidene)-2-oxo-2,3-dihydro-indole-1-carboxylic acid ethyl ester prepared in example 6b (0.3 g, 0.83 mmol). The reaction mixture was stirred under nitrogen in a sealed tube at 135° C. for 1 h. After the solution was cooled to room temperature, methanol (50 mL) was added, and then the mixture was concentrated. The residue was purified by chromatography (EtOAc:CH2Cl2=1:3) to give racemic (2′R,3R,4′S)-6-chloro-2′,4′-bis(3-chlorophenyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid ethyl ester as a yellow oil (Yield 0.45 g, 100%).

Workup

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-cdd115688aa24b07913b67b45e163dd6
Source dataset: uspto-grants-2009_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07495007B2

Reaction notes

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