2,2-Dimethoxypropane → (2R)-2-[(4S)-2,2-dimethyl-5-oxo-1,3-dioxolan-4-yl]propanoic acid

HRID 1677766노트

반응식

HRID 1677766 반응식
[OH:1][C@@H:2]([C@@H:6]([CH3:10])[C:7]([OH:9])=[O:8])[C:3]([OH:5])=[O:4].CO[C:13](OC)([CH3:15])[CH3:14]>CC(C)=O.[Cu](Cl)Cl>[CH3:14][C:13]1([CH3:15])[O:1][C@@H:2]([C@@H:6]([CH3:10])[C:7]([OH:9])=[O:8])[C:3](=[O:5])[O:4]1

참가 물질

5

반응물 2

HCID 64952,2-DimethoxypropaneHCID 14325352(2S,3R)-2-hydroxy-3-methylbutanedioic acid

생성물 1

HCID 58488031(2R)-2-[(4S)-2,2-dimethyl-5-oxo-1,3-dioxolan-4-yl]propanoic acid수율 82%

시약·촉매·용매 2

HCID 24014Cupric Chloride촉매HCID 180Acetone용매

실험 절차

To a solution of (2S,3R)-2-hydroxy-3-methylsuccinic acid (2.40 g; 16.2 mmol; 1.0 eq.) in acetone (80.0 mL) was added 2,2-dimethoxypropane (3.98 g; 32.4 mmol; 2.0 eq.) and copper(II) chloride (218 mg; 1.62 mmol; 0.1 eq.). The resulting reaction mixture was stirred for 4 h at RT. The reaction mixture was evaporated and the residue taken up in CHCl3. Activated charcoal is added and the resulting mixture stirred for one hour. Filtration on a pad of celite gave the title product (mixture of diastereoisomers) as a greenish oil (2.48 g, 82%) used in the next step without further purification.

후처리

  1. customThe resulting reaction mixture
  2. customThe reaction mixture was evaporated
  3. additionActivated charcoal is added
  4. stirringthe resulting mixture stirred for one hour
  5. filtrationFiltration on a pad of celite

출처 및 근거

ORD 기록
ord-168aa7734ff547db816b722a133cb381
출처 데이터셋
uspto-grants-2011_08
특허 번호
US08008302B2

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