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Cesium fluoride → 4-Acetylamino-3-chloro-6-(2,4-difluoro-3-methylphenyl)-pyridine-2-carboxylic acid methyl ester

HRID 1782616
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HRID 1782616 반응식
Br[C:2]1[CH:7]=[CH:6][C:5]([F:8])=[C:4]([CH3:9])[C:3]=1[F:10].[CH3:11][O:12][C:13]([C:15]1[C:20]([Cl:21])=[C:19]([NH:22][C:23](=[O:25])[CH3:24])[CH:18]=[C:17]([Sn](C)(C)C)[N:16]=1)=[O:14].C1(P(C2C=CC=CC=2)CCCCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[F-].[Cs+]>C(#N)C.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH3:11][O:12][C:13]([C:15]1[C:20]([Cl:21])=[C:19]([NH:22][C:23](=[O:25])[CH3:24])[CH:18]=[C:17]([C:2]2[CH:7]=[CH:6][C:5]([F:8])=[C:4]([CH3:9])[C:3]=2[F:10])[N:16]=1)=[O:14]
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참가 물질

7

반응물 4

HCID 25953Cesium fluorideHCID 821241,4-Bis(diphenylphosphino)butaneHCID 112872263-Bromo-2,6-difluorotolueneHCID 226773084-Acetylamino-3-chloro-6-trimethylstannylpyridine-2-carboxylic acid methyl ester

생성물 1

HCID 685975834-Acetylamino-3-chloro-6-(2,4-difluoro-3-methylphenyl)-pyridine-2-carboxylic acid methyl ester수율 20%

시약·촉매·용매 2

HCID 167845palladium(II) acetate촉매HCID 6342Acetonitrile용매

실험 절차

A solution of 1-bromo-2,4-difluoro-3-methylbenzene (2.10 g, 0.09 mol), 4-acetylamino-3-chloro-6-trimethylstannylpyridine-2-carboxylic acid methyl ester (4.00 g, 0.01 mol), 1,4-bis(diphenylphosphino)butane (0.140 g, 0.0003 mol) and cesium fluoride (4.5 g, 0.03 mol) in acetonitrile (100 mL) was degassed with nitrogen. Palladium acetate (0.70 g, 0.0003 mol) was added the solution heated to reflux for 2 hours. The reaction mixture was filtered through celite and the filtrate diluted with water (200 mL) and then extracted with ethyl acetate (2×150 mL). The combined organic phases were dried and concentrated and the residual solid was purified by chromatography (50% ethyl acetate in hexanes) to give 4-acetylamino-3-chloro-6-(2,4-difluoro-3-methylphenyl)-pyridine-2-carboxylic acid methyl ester (0.800 g, 0.002 mol): mp 152-153° C.

후처리

  1. temperatureheated
  2. temperatureto reflux for 2 hours
  3. filtrationThe reaction mixture was filtered through celite
  4. additionthe filtrate diluted with water (200 mL)
  5. extractionextracted with ethyl acetate (2×150 mL)
  6. customThe combined organic phases were dried
  7. concentrationconcentrated
  8. customthe residual solid was purified by chromatography (50% ethyl acetate in hexanes)

출처 및 근거

ORD 기록
ord-100bc78c6db840f1b52b9e256a480b2c
출처 데이터셋
uspto-grants-2009_03
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US07498468B2

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