Nitroethane → 3-Methyl-5-(4-methylphenyl)isoxazole

HRID 1669800노트

반응식

HRID 1669800 반응식
C1(N=C=O)C=CC=CC=1.[C:10]([C:12]1[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=1)#[CH:11].[N+:19]([CH2:22][CH3:23])([O-])=[O:20].C(N(CC)CC)C>C1C=CC=CC=1.O>[CH3:23][C:22]1[CH:11]=[C:10]([C:12]2[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=2)[O:20][N:19]=1

참가 물질

7

반응물 4

HCID 6587NitroethaneHCID 7672Phenyl isocyanateHCID 8471TriethylamineHCID 13018p-Ethynyltoluene

생성물 1

HCID 103521723-Methyl-5-(4-methylphenyl)isoxazole

시약·촉매·용매 2

HCID 241Benzene용매HCID 962Water용매

실험 절차

6.23 ml (57.39 mmol) of phenyl isocyanate are added dropwise at room temperature to a solution of 5 g (43.04 mmol) of 1-ethynyl-4-methylbenzene, 1 ml (14.34 mmol) of nitroethane and 0.4 ml (2.87 mmol) of triethylamine in 100 ml of benzene. The reaction mixture is then stirred under reflux for 12 h. After cooling, the suspension is mixed with water (50 ml) and stirred at room temperature for a further 4 h. The precipitate is filtered off with suction and washed with benzene (10 ml). The organic phase of the filtrate is separated off, dried with magnesium sulfate and concentrated. The residue is purified by column chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate 6:1). 1.13 g (46% of theory) of the title compound are obtained as a colourless oil.

후처리

  1. temperatureunder reflux for 12 h
  2. temperatureAfter cooling
  3. stirringstirred at room temperature for a further 4 h
  4. filtrationThe precipitate is filtered off with suction
  5. washwashed with benzene (10 ml)
  6. customThe organic phase of the filtrate is separated off
  7. dry with materialdried with magnesium sulfate
  8. concentrationconcentrated
  9. customThe residue is purified by column chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate 6:1)

출처 및 근거

ORD 기록
ord-c18b0c05541743429217e7dd1b28c986
출처 데이터셋
uspto-grants-2011_08
특허 번호
US07989633B2

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