Toluene → Ethyl 2-[2,6-bis(methoxymethoxy)-3-methyl-phenyl]prop-2-enoate

HRID 1484629노트

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HRID 1484629 반응식
C[Si]([N-][Si](C)(C)C)(C)C.[K+].[C:11]1(C)C=CC=CC=1.[CH3:18][O:19][CH2:20][O:21][C:22]1[C:27]([CH3:28])=[CH:26][CH:25]=[C:24]([O:29][CH2:30][O:31][CH3:32])[C:23]=1[C:33](=O)[C:34]([O:36][CH2:37][CH3:38])=[O:35]>[Br-].C[P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O1CCCC1>[CH3:18][O:19][CH2:20][O:21][C:22]1[C:27]([CH3:28])=[CH:26][CH:25]=[C:24]([O:29][CH2:30][O:31][CH3:32])[C:23]=1[C:33](=[CH2:11])[C:34]([O:36][CH2:37][CH3:38])=[O:35]

참가 물질

6

반응물 3

HCID 1140TolueneHCID 3251421Potassium bis(trimethylsilyl)amideHCID 67958347Ethyl 2-[2,6-bis(methoxymethoxy)-3-methyl-phenyl]-2-oxo-acetate2회

생성물 1

HCID 67958720Ethyl 2-[2,6-bis(methoxymethoxy)-3-methyl-phenyl]prop-2-enoate수율 83.1%

시약·촉매·용매 2

HCID 74505Methyltriphenyliphosphonium bromide촉매HCID 8028Tetrahydrofuran용매2회

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온도
0 °C

실험 절차

To a suspension of methyltriphenylphosphonium bromide (8.78 g, 24.6 mmol) in dry tetrahydrofuran (50 ml) at 0° C. KHMDS 0.5M solution in toluene (44.22 ml, 22.11 mmol) was slowly added and the reaction mixture was stirred for 15 minutes at 0° C. and for 45 minutes at room temperature. The reaction mixture was cooled to 0° C. and it was slowly added to a solution of ethyl 2-[2,6-bis(methoxymethoxy)-3-methyl-phenyl]-2-oxo-acetate (Intermediate 8, 4.6 g, 14.74 mmol) in dry tetrahydrofuran (25 mL) at 0° C. and the reaction mixture was stirred for 2 hours at 0° C. The reaction was quenched with water (50 ml), diluted with brine (50 ml) and extracted with ethyl acetate (2×100 ml). The organic layer was dried over sodium sulphate, filtered and evaporated. The residue was purified by flash chromatography (Biotage system) on silica gel using a 100 g SNAP column and cyclohexane to cyclohexane/ethyl acetate 8:2 as eluents affording the title compound (3.8 g) as a colourless oil.

후처리

  1. temperatureThe reaction mixture was cooled to 0° C.
  2. stirringthe reaction mixture was stirred for 2 hours at 0° C
  3. customThe reaction was quenched with water (50 ml)
  4. additiondiluted with brine (50 ml)
  5. extractionextracted with ethyl acetate (2×100 ml)
  6. dry with materialThe organic layer was dried over sodium sulphate
  7. filtrationfiltered
  8. customevaporated
  9. customThe residue was purified by flash chromatography (Biotage system) on silica gel using a 100 g SNAP column and cyclohexane to cyclohexane/ethyl acetate 8:2 as eluents

출처 및 근거

ORD 기록
ord-ec4db8bf64cb4625ad90595543a2d999
출처 데이터셋
uspto-grants-2016_08
특허 번호
US09422272B2

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