Ethyl Acetate → benzyl (2S,3S)-3-hydroxy-2,3-dimethylpyrrolidine-1-carboxylate

HRID 1173585ノート

反応式

HRID 1173585 の反応式
[Cl-].[Ce+3].[Cl-].[Cl-].C[Mg]Br.[CH2:8](OCC)C.[CH3:13][C@H:14]1[C:18](=[O:19])[CH2:17][CH2:16][N:15]1[C:20]([O:22][CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)=[O:21].C(OCC)(=O)C>C1COCC1>[OH:19][C@@:18]1([CH3:8])[CH2:17][CH2:16][N:15]([C:20]([O:22][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)=[O:21])[C@H:14]1[CH3:13]

参加物

6

反応物 4

HCID 8857Ethyl AcetateHCID 24636Cerium(III) chlorideHCID 59556933benzyl (2S)-2-methyl-3-oxopyrrolidine-1-carboxylateHCID 178467822HCID 178467822、化合物

生成物 1

HCID 59557026benzyl (2S,3S)-3-hydroxy-2,3-dimethylpyrrolidine-1-carboxylate収率 84%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
-78 °C

実験手順

A suspension of cerium chloride (47 g) in THF (300 mL) was cooled to −78° C., methylmagnesium bromide-diethyl ether solution (56 mL, 3 mol/L) was added dropwise while adjusting the solution temperature to −70° C. or below. After the completion of the dropwise addition, the mixture was stirred at −78° C. for 30 min, a solution of benzyl(2S)-2-methyl-3-oxopyrrolidine-1-carboxylate (18 g) in THF (60 mL) was added dropwise while adjusting the solution temperature to −70° C. or below. The reaction mixture was warmed to 0° C. over 2 hr, ethyl acetate (1 L) was added, and insoluble materials were filtered off. The filtrate was partitioned with water, and the organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=9/1→1/1) to give the title compound as a colorless oil (yield: 16.2 g, 84%).

後処理

  1. customto −70° C. or below
  2. additionAfter the completion of the dropwise addition
  3. customto −70° C. or below
  4. temperatureThe reaction mixture was warmed to 0° C. over 2 hr
  5. filtrationinsoluble materials were filtered off
  6. customThe filtrate was partitioned with water
  7. washthe organic layer was washed with saturated brine
  8. dry with materialdried over anhydrous sodium sulfate
  9. concentrationconcentrated under reduced pressure
  10. customThe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=9/1→1/1)

出典と根拠

ORDレコード
ord-0b32a61df77c47d9915374284832dad3
出典データセット
uspto-grants-2010_11
特許番号
US07834051B2

反応ノート

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