Diisopropylamine → 2-(2,4-difluorophenoxy)-3-hydroxy-3-[4-nitro-2-(2-trimethylsilanyl-ethoxymethyl)-2H-pyrazol-3-yl]propionic acid methyl ester

HRID 2114554노트

반응식

HRID 2114554 반응식
C(NC(C)C)(C)C.C([Li])CCC.[CH3:13][O:14][C:15](=[O:26])[CH2:16][O:17][C:18]1[CH:23]=[CH:22][C:21]([F:24])=[CH:20][C:19]=1[F:25].[N+:27]([C:30]1[CH:34]=[N:33][N:32]([CH2:35][O:36][CH2:37][CH2:38][Si:39]([CH3:42])([CH3:41])[CH3:40])[C:31]=1[CH:43]=[O:44])([O-:29])=[O:28]>C(OCC)C.[Cl-].[NH4+].C(OCC)(=O)C.O>[CH3:13][O:14][C:15](=[O:26])[CH:16]([O:17][C:18]1[CH:23]=[CH:22][C:21]([F:24])=[CH:20][C:19]=1[F:25])[CH:43]([OH:44])[C:31]1[N:32]([CH2:35][O:36][CH2:37][CH2:38][Si:39]([CH3:41])([CH3:40])[CH3:42])[N:33]=[CH:34][C:30]=1[N+:27]([O-:29])=[O:28]

참가 물질

9

반응물 4

HCID 7912DiisopropylamineHCID 23434554Methyl 2-(2,4-difluorophenoxy)acetateHCID 863462134-Nitro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazole-5-carbaldehydeHCID 178418339Butyllithium

생성물 1

HCID 598129592-(2,4-difluorophenoxy)-3-hydroxy-3-[4-nitro-2-(2-trimethylsilanyl-ethoxymethyl)-2H-pyrazol-3-yl]propionic acid methyl ester

시약·촉매·용매 4

HCID 962Water용매HCID 3283Diethyl Ether용매3회HCID 8857Ethyl Acetate용매HCID 25517Ammonium Chloride용매

실험 절차

To a −78° C. solution of diisopropylamine (0.3 mL, 2.1 eq) in diethyl ether (3 mL) was added a 2.5 M solution of n-butyllithium in hexanes (Aldrich) (0.84 mL, 2.1 eq). The resulting mixture was stirred for 15 minutes. To this mixture was added a solution of (2,4-difluorophenoxy)acetic acid methyl ester (425 mg, 2.1 eq) in diethyl ether (2 mL) via a syringe, and the resulting mixture was stirred at −78° C. for 30 minutes, after which a solution of 4-nitro-2-(2-trimethylsilanyl-ethoxymethyl)-2H-pyrazole-3-carbaldehyde (271 mg, 1 mmol) in diethyl ether (2 mL) was added. The resulting mixture was stirred for 2 hours. The −78° C. reaction mixture was diluted with a saturated aqueous ammonium chloride solution, then diluted with ethyl acetate (150 mL) and water (25 mL). The organic layer was separated, washed with brine (1×50 mL), dried over magnesium sulfate, filtered and concentrated to give the crude product as an oil (709 mg). Purification of the crude product by Preparative Thin Layer Chromatography eluting with 25% ethyl acetate in hexanes gave the title compound as a diastereomeric mixture (257 mg, thick colorless oil). M+=473.

후처리

  1. stirringthe resulting mixture was stirred at −78° C. for 30 minutes
  2. stirringThe resulting mixture was stirred for 2 hours
  3. customThe −78° C. reaction mixture
  4. customThe organic layer was separated
  5. washwashed with brine (1×50 mL)
  6. dry with materialdried over magnesium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customto give the crude product as an oil (709 mg)
  10. customPurification of the crude product by Preparative Thin Layer Chromatography
  11. washeluting with 25% ethyl acetate in hexanes

출처 및 근거

ORD 기록
ord-be2055c7e84f4f858d7fa349c9d8a783
출처 데이터셋
uspto-grants-2008_10
특허 번호
US07435731B2

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