3-Boc-2,2-dimethyloxazolidine-4-carboxaldehyde, (S)-(-)- → (R)-4-[(1R,2S)-3-(3,5-difluorophenyl)-1-hydroxy-2-nitropropyl]-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester

HRID 20420ノート

反応式

HRID 20420 の反応式
[F-].C([N+](CCCC)(CCCC)CCCC)CCC.[C:19]([O:23][C:24]([N:26]1[C@H:30]([CH:31]=[O:32])[CH2:29][O:28][C:27]1([CH3:34])[CH3:33])=[O:25])([CH3:22])([CH3:21])[CH3:20].[F:35][C:36]1[CH:41]=[C:40]([CH2:42][CH2:43][N+:44]([O-:46])=[O:45])[CH:39]=[C:38]([F:47])[CH:37]=1>O1CCCC1>[C:19]([O:23][C:24]([N:26]1[C@@H:30]([C@@H:31]([OH:32])[C@@H:43]([N+:44]([O-:46])=[O:45])[CH2:42][C:40]2[CH:41]=[C:36]([F:35])[CH:37]=[C:38]([F:47])[CH:39]=2)[CH2:29][O:28][C:27]1([CH3:34])[CH3:33])=[O:25])([CH3:22])([CH3:21])[CH3:20]

参加物

5

反応物 3

HCID 1798243-Boc-2,2-dimethyloxazolidine-4-carboxaldehyde, (S)-(-)-HCID 2724141Tetrabutylammonium FluorideHCID 552507531,3-Difluoro-5-(2-nitroethyl)benzene

生成物 1

HCID 58972248(R)-4-[(1R,2S)-3-(3,5-difluorophenyl)-1-hydroxy-2-nitropropyl]-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester収率 37.7%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

実験手順

Add tetrabutylammonium fluoride in 5 minutes (50 mL, 50 mmol, 1.0 M solution in tetrahydrofuran) to a solution of (S)-4-formyl-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester (200 g, 873.362 mmol) and 1,3-difluoro-5-(2-nitroethyl)-benzene (164 g, 877.005 mmol) in tetrahydrofuran (1.2 L) at 8° C. Allow to warm to room temperature and stir for 14 hours. Partition between ethyl acetate (4 L) and saturated aqueous sodium chloride (1.5 L). Wash the organic layer with saturated aqueous ammonium chloride, saturated aqueous sodium chloride, water, dry (magnesium sulfate), filter and concentrate to give 379 g of a crude waxy pale orange solid. Recrystallize in dichloromethane/hexanes to give the title compound (137.15 g, 37.7%).

後処理

  1. customPartition between ethyl acetate (4 L) and saturated aqueous sodium chloride (1.5 L)
  2. washWash the organic layer with saturated aqueous ammonium chloride, saturated aqueous sodium chloride, water
  3. dry with materialdry (magnesium sulfate)
  4. filtrationfilter
  5. concentrationconcentrate
  6. customto give 379 g of a crude waxy pale orange solid
  7. customRecrystallize in dichloromethane/hexanes

出典と根拠

ORDレコード
ord-74539357565a492c9ff90b62911522ae
出典データセット
uspto-grants-2010_06
特許番号
US07745438B2

反応ノート

読み込み中…