Hydrogen Bromide → (R)-Methyl 2-bromo-2-phenylacetate

HRID 1750972노트

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HRID 1750972 반응식
N[C@@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[C:3]([O:5][CH3:6])=[O:4].[BrH:13].N([O-])=O.[Na+]>O>[Br:13][C@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[C:3]([O:5][CH3:6])=[O:4]

참가 물질

5

반응물 3

HCID 260Hydrogen BromideHCID 1201451Methyl phenylglycinate, L-HCID 23668193Sodium Nitrite

생성물 1

HCID 6993590(R)-Methyl 2-bromo-2-phenylacetate수율 40.5%

시약·촉매·용매 1

HCID 962Water용매

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온도
0 °C

실험 절차

(S)-methyl 2-amino-2-phenylacetate (5 g, 24.8 mmol, 1 equiv) was dissolved in a mixture of 48% hydrogen bromide (13 ml, 198 mmol, 8 equiv) and water (19 ml). An aqueous solution of sodium nitrite (5.48 g, 79.36 mmol, 3.2 equiv) was added slowly and the mixture stirred at 0° C. for 1.5 h. The reaction was degassed in vacuo and extracted with ether. The organic layer was further washed with water and brine, dried over MgSO4, and concentrated in vacuo. The resulting residue was purified using the Biotage flash chromatography system (SNAP 100 g cartridge, Rf=0.5, gradient—1%-10% ethyl acetate/hexanes) to afford the (R)-methyl 2-bromo-2-phenylacetate as a light yellow oil (2.3 g, 40% yield).). 1H NMR (400 MHz, DMSO-d6): δ 3.72 (s, 3H); 5.95 (s, 1H); 7.36-7.42 (m, 3H); 7.54 (d, 2H, J=1.6 Hz); 7.56 (d, 1H, J=2 Hz). MS for C9H9BrO2 m/z 229.98 (M+H)+.

후처리

  1. customThe reaction was degassed in vacuo
  2. extractionextracted with ether
  3. washThe organic layer was further washed with water and brine
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated in vacuo
  6. customThe resulting residue was purified

출처 및 근거

ORD 기록
ord-58f0301424be4211be24646eefea60c7
출처 데이터셋
uspto-grants-2015_10
특허 번호
US09156840B2

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