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Ammonium Chloride → 4-(2-Chlorophenyl)-2,2-dimethyl-5-oxopiperazine-1-carboxylic acid t-butyl ester

HRID 1694891
ノート
印刷プレビュー

反応式

HRID 1694891 の反応式
CC(C)([O-])C.[K+].[C:7]([O:11][C:12](=[O:30])[NH:13][C:14]([CH3:29])([CH3:28])[CH2:15][N:16]([C:24](=[O:27])[CH2:25]Br)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[Cl:23])([CH3:10])([CH3:9])[CH3:8].[Cl-].[NH4+]>O1CCCC1.O>[C:7]([O:11][C:12]([N:13]1[CH2:25][C:24](=[O:27])[N:16]([C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=2[Cl:23])[CH2:15][C:14]1([CH3:29])[CH3:28])=[O:30])([CH3:10])([CH3:9])[CH3:8]
参加物実験手順後処理出典と根拠反応ノート

参加物

6

反応物 3

HCID 25517Ammonium ChlorideHCID 23665647Potassium tert-butoxideHCID 66645498{2-[(2-Bromoacetyl)-(2-chlorophenyl)amino]-1,1-dimethylethyl}carbamic acid t-butyl ester

生成物 1

HCID 666454674-(2-Chlorophenyl)-2,2-dimethyl-5-oxopiperazine-1-carboxylic acid t-butyl ester収率 81%

試薬・触媒・溶媒 2

HCID 962Water溶媒
HCID 8028
Tetrahydrofuran
溶媒
2 回

実験手順

A solution of 1.87 g of potassium t-butoxide (16.7 mmol) in tetrahydrofuran (110 ml) was added to a solution of 4.68 g of {2-[(2-bromoacetyl)-(2-chlorophenyl)amino]-1,1-dimethylethyl}carbamic acid t-butyl ester obtained in Example (1i) (11.2 mmol) in tetrahydrofuran (110 ml) under a nitrogen atmosphere and under cooling in a dry ice-acetone bath over 30 minutes, and the mixture was stirred at the same temperature for 10 minutes. A saturated ammonium chloride aqueous solution was added to the reaction mixture. The mixture was returned to room temperature and diluted with water, followed by extraction with ethyl acetate. Then, the organic layer was dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:hexane/ethyl acetate=2/1) to obtain 3.07 g of the title compound (yield: 81%).

後処理

  1. temperatureunder cooling in a dry ice-acetone bath over 30 minutes
  2. customwas returned to room temperature
  3. extractionfollowed by extraction with ethyl acetate
  4. dry with materialThen, the organic layer was dried over anhydrous magnesium sulfate
  5. filtrationAfter filtration
  6. customthe solvent was evaporated under reduced pressure
  7. customthe residue was purified by silica gel column chromatography (elution solvent:hexane/ethyl acetate=2/1)

出典と根拠

ORDレコード
ord-63fe92cf022f4d14a8617d3193ab3f12
出典データセット
uspto-grants-2012_04
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US08158790B2

反応ノート

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