Water → Tert-Butyl 4-{2-[(1S)-1-(Acetylamino)Ethyl]-4-Chlorophenyl}Piperidine-1-Carboxylate

HRID 2415557ノート

反応式

HRID 2415557 の反応式
[C:1](Cl)(=[O:3])[CH3:2].[NH2:5][C@H:6]([C:8]1[CH:13]=[C:12]([Cl:14])[CH:11]=[CH:10][C:9]=1[CH:15]1[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]1)[CH3:7].C(N(CC)CC)C.O>ClCCl>[C:1]([NH:5][C@H:6]([C:8]1[CH:13]=[C:12]([Cl:14])[CH:11]=[CH:10][C:9]=1[CH:15]1[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:26])([CH3:25])[CH3:27])=[O:22])[CH2:17][CH2:16]1)[CH3:7])(=[O:3])[CH3:2]

参加物

6

反応物 4

HCID 962WaterHCID 6367Acetyl chlorideHCID 8471TriethylamineHCID 68518377Tert-Butyl 4-{2-[(1S)-1-Aminoethyl]-4-Chlorophenyl]Piperidine-1-Carboxylate

生成物 1

HCID 11668043Tert-Butyl 4-{2-[(1S)-1-(Acetylamino)Ethyl]-4-Chlorophenyl}Piperidine-1-Carboxylate収率 96.1%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

Acetyl chloride (1.71 mL, 24.0 mmol) was added to a solution of crude tert-butyl 4-{2-[(1S)-1-aminoethyl]-4-chlorophenyl}piperidine-1-carboxylate (3-7) (5.42 g of ˜70% pure material, 11.2 mmol) and triethylamine (6.69 mL, 48.0 mmol) in dichloromethane at approximately 0° C. After 2 h, the reaction mixture was poured into water and extracted three times with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. Purification of the crude residue by flash chromatography on silica gel (gradient elution; 35 to 50% ethyl acetate/hexanes as eluent) provided tert-butyl 4-{2-[(1S)-1-(acetylamino)ethyl]-4-chlorophenyl}piperidine-1-carboxylate (3-8) as a pale yellow foam (4.1 g). If desired, traces of the minor R-enantiomer could be removed using preparative chiral high pressure liquid chromatography on CHIRALPAK AD Phase, (7.5% ethano/heptanes as eluent) to give in order of elution: R-enantiomer as a colorless solid followed by the S-enantiomer as a colorless solid.

後処理

  1. extractionextracted three times with ethyl acetate
  2. washThe combined organic extracts were washed with brine
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated in vacuo
  5. customPurification of the crude residue by flash chromatography on silica gel (gradient elution; 35 to 50% ethyl acetate/hexanes as eluent)

出典と根拠

ORDレコード
ord-9e27475635f240bfa6158d208f924b5b
出典データセット
uspto-grants-2004_11
特許番号
US06818658B2

反応ノート

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