3-Bromobenzaldehyde → 2-(3-Bromophenyl)-4,5-dimethyloxazole-3-oxide

HRID 2228979노트

반응식

HRID 2228979 반응식
[CH3:1][C:2](=[N:6][OH:7])[C:3](=[O:5])[CH3:4].[Br:8][C:9]1[CH:10]=[C:11]([CH:14]=[CH:15][CH:16]=1)[CH:12]=O>C(O)(=O)C>[Br:8][C:9]1[CH:10]=[C:11]([C:12]2[O:5][C:3]([CH3:4])=[C:2]([CH3:1])[N+:6]=2[O-:7])[CH:14]=[CH:15][CH:16]=1

참가 물질

4

반응물 2

HCID 765833-BromobenzaldehydeHCID 63989692-Oxime 2,3-butanedione

생성물 1

HCID 40877752-(3-Bromophenyl)-4,5-dimethyloxazole-3-oxide수율 74.1%

시약·촉매·용매 1

HCID 176Acetic Acid용매

실험 절차

A solution of 2,3-butanedione monooxime (50 g, 0.49 mol) and 3-bromobenzaldehyde (101 g, 0.54 mol) in acetic acid (500 mL) was cooled to 0° C. and then gaseous HCl was bubbled through the solution for 35 min while the reaction was stirred in an ice bath. Diethyl ether (500 mL) was then added to the reaction to precipitate the product and the resultant slurry stirred 45 min at 0° C. before being filtered. The solids were rinsed with Et2O (50 mL), taken up in water (1 L) and concentrated NH4OH (60 mL) added to the slurry. This mixture was extracted with CHCl3, the organic layer was dried (MgSO4), and the solvent removed in vacuo to give 97.4 g (74%) of 2-(3-bromophenyl)-4,5-dimethyloxazole-3-oxide as a white solid. The compound should be used directly with 24-48 h. 1H NMR (300 MHz, CDCl3) δ8.60 (s, 1H), 8.40 (d, J=8.0 Hz, 1H), 7.55 (d, J=8.0 Hz, 1H), 7.38 (d, J=8.0 Hz, 1H), 2.39 (s, 3H), 2.20 (s, 3H).

후처리

  1. customgaseous HCl was bubbled through the solution for 35 min while the reaction
  2. additionDiethyl ether (500 mL) was then added to the reaction
  3. customto precipitate the product
  4. stirringthe resultant slurry stirred 45 min at 0° C.
  5. filtrationbefore being filtered
  6. washThe solids were rinsed with Et2O (50 mL)
  7. additionconcentrated NH4OH (60 mL) added to the slurry
  8. extractionThis mixture was extracted with CHCl3
  9. dry with materialthe organic layer was dried (MgSO4)
  10. customthe solvent removed in vacuo

출처 및 근거

ORD 기록
ord-d073ceb61808435e9455979324412d45
출처 데이터셋
uspto-grants-2002_07
특허 번호
US06417212B1

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