Reaction equation
[Br:1][C:2]1[CH:23]=[CH:22][C:5]([C:6]([N:8]2[CH2:13][CH2:12][C:11]([C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=3O)([OH:14])[CH2:10][CH2:9]2)=[O:7])=[CH:4][CH:3]=1.C(=O)([O-])[O-:25].[K+].[K+].O.[CH2:31]([O:33][C:34](=[O:39])[C:35](Br)([CH3:37])[CH3:36])[CH3:32]>>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:6]([N:8]2[CH2:13][CH2:12][C:11]([C:15]3[CH:16]=[C:17]([CH:18]=[CH:19][CH:20]=3)[O:25][C:35]([CH3:37])([CH3:36])[C:34]([O:33][CH2:31][CH3:32])=[O:39])([OH:14])[CH2:10][CH2:9]2)=[O:7])=[CH:22][CH:23]=1Participants
5
Procedure
801 mg of {1-(4-bromobenzoyl)-4-(2-hydroxyphenyl)-4-hydroxypiperidine was stirred for 9 hours at the ambient temperature of 100° C. in the presence of 1.20 g (8.68 mmol) of potassium carbonate in 4.00 g (20.5 ml) of ethylα-bromoisobutyrate. After completion of the reaction, The reaction mixture was cooled, and water was added thereto, followed by extraction with chloroform. Subsequently, the extract was dried over anhydrous sodium sulfate. Chloroform and the remained ethyl α-bromoisobutyrate was distilled off under reduced pressure to obtain 902 mg (86.4%) of ethyl 3-{1-(4-bromobenzoyl)-4-hydroxypiperidin-4-yl}α,α-dimethylphenoxyacetate.
Workup
- customAfter completion of the reaction
- temperatureThe reaction mixture was cooled
- extractionfollowed by extraction with chloroform
- dry with materialSubsequently, the extract was dried over anhydrous sodium sulfate
- distillationChloroform and the remained ethyl α-bromoisobutyrate was distilled off under reduced pressure
Sources & evidence
- ORD record
- ord-004d54879f88431ca2eb482dd4019232
- Source dataset
- uspto-grants-1995_05
- Patent number
- US05411972
Linked notes
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