Water → 7-(1-Hydroxy-1-p-nitrobenzyloxycarbonylmethyl)-8-oxo-7-azabicyclo[4,2,0]-oct-3-ene

HRID 1388289노트

반응식

HRID 1388289 반응식
O.[C:2]([O:6][CH2:7][C:8]1[CH:13]=[CH:12][C:11]([N+:14]([O-:16])=[O:15])=[CH:10][CH:9]=1)(=[O:5])[CH:3]=[O:4].O.[O:18]=[C:19]1[CH:26]2[CH:21]([CH2:22][CH:23]=[CH:24][CH2:25]2)[NH:20]1>C1C=CC=CC=1>[OH:4][CH:3]([N:20]1[C:19](=[O:18])[CH:26]2[CH:21]1[CH2:22][CH:23]=[CH:24][CH2:25]2)[C:2]([O:6][CH2:7][C:8]1[CH:13]=[CH:12][C:11]([N+:14]([O-:16])=[O:15])=[CH:10][CH:9]=1)=[O:5]

참가 물질

5

반응물 3

HCID 962WaterHCID 3002787-Azabicyclo[4.2.0]oct-3-en-8-oneHCID 21934455p-Nitrobenzyl glyoxylate hydrate

생성물 1

HCID 127969397-(1-Hydroxy-1-p-nitrobenzyloxycarbonylmethyl)-8-oxo-7-azabicyclo[4,2,0]-oct-3-ene

시약·촉매·용매 1

HCID 241Benzene용매

실험 절차

p-Nitrobenzyl glyoxylate hydrate (9.08 g) was refluxed in benzene (150 ml) with provision for the removal of water. After 1 hour 8-oxo-7-azabicyclo[4.2.0]oct-3-ene (1) (2.46 g) was added and refluxing continued for 3.5 hours. The cooled solution was washed with water (x 2), then brine. After back extraction of the first aqueous extract with ethyl acetate, the organic solutions were dried over magnesium sulphate, filtered combined, and evaporated. Chromatography on silica, eluting with ethyl acetate-petroleum ether mixtures gave two separate isomers of the alcohol (54) (43%). Less polar isomer I m.p. 153-5° (crystalline plates ex ethyl acetate/ether), νmax (CHCl3) 3400 (broad), 1760, 1745, 1520, 1350 cm-1. δ ppm (CDCl3) 1.90-2.83 (4H, m, 2-CH2), 3.23-3.55 (1H, m, β-lactam proton), 4.00-4.20 (1H, m, β-lactam proton), 4.27 (1H, d, J 8 Hz, exchangeable with D2O, OH), 5.33 (2H, s, CH2Ar)-obscuring 1H, CHOH; 5.67-5.88 (2H, m, CH=CH), 7.55 (2H, d, J 8.5 Hz, Ar), 8.23 (2H, d, J 8.5 Hz, Ar) (Found: C, 58.07; H, 5.15; N, 8.51%, C16H16N2O6 requires C, 57.83; H, 4.85; N, 8.43%). More polar isomer II m.p. 118°-120° (fine crystalline needles ex ethyl acetate/ether). νmax (CHCl3) 3400 (broad), 1760-1745, 1520, 1350 cm-1. δ ppm (CDCl3) 1.83-2.77 (4H, m, 2-CH2), 3.25-3.55 (1H, m, β-lactam proton), 4.02-4.37 (2H, m, β-lactam proton and CHOH, -OH exchangeable with D2O), 5.31-5.98 [5H, 5.35 (2H, s, CH2Ar), obscuring, 1H, which sharpens to s, at δ 5.40 on D2O exchange, CHOH, and 2H, m, CH=CH], 7.56 (2H, d, J 8 Hz, Ar), 8.23 (2H, d, J 8 Hz, Ar) (Found: C, 57.95; H, 4.95; N, 8.50%. C16H16N2O6 requires C, 57.83; H, 4.85; N, 8.43%).

후처리

  1. temperaturerefluxing
  2. washThe cooled solution was washed with water (x 2)
  3. extractionAfter back extraction of the first
  4. extractionaqueous extract with ethyl acetate
  5. dry with materialthe organic solutions were dried over magnesium sulphate
  6. filtrationfiltered
  7. customevaporated
  8. washChromatography on silica, eluting with ethyl acetate-petroleum ether mixtures
  9. customgave two
  10. customseparate isomers of the alcohol (54) (43%)

출처 및 근거

ORD 기록
ord-cbadc79899a04148a6c3ff1027d783c6
출처 데이터셋
uspto-grants-1984_02
특허 번호
US04431587

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