Potassium Carbonate → 2-Chloro-3-fluoro-5-vinylpyridine

HRID 920131

반응식

HRID 920131 반응식
Br[C:2]1[CH:3]=[C:4]([F:9])[C:5]([Cl:8])=[N:6][CH:7]=1.[CH3:10][C:11]1(C)CC(C)OB(C=C)O1.C([O-])([O-])=O.[K+].[K+]>CCCC[N+](CCCC)(CCCC)CCCC.[F-].C1COCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O>[Cl:8][C:5]1[C:4]([F:9])=[CH:3][C:2]([CH:10]=[CH2:11])=[CH:7][N:6]=1

참가 물질

8

반응물 3

HCID 11430Potassium CarbonateHCID 1073104,4,6-Trimethyl-2-vinyl-1,3,2-dioxaborinaneHCID 27632855-Bromo-2-chloro-3-fluoropyridine

생성물 1

HCID 748918632-Chloro-3-fluoro-5-vinylpyridine수율 94.9%

시약·촉매·용매 4

HCID 178418476HCID 178418476, 화합물촉매HCID 962Water용매HCID 8028Tetrahydrofuran용매HCID 2724141Tetrabutylammonium Fluoride용매

반응 조건

온도
60 °C

실험 절차

To a solution of 101 (5.00 g, 23.8 mmol) and 4,4,6-trimethyl-2-vinyl-1,3,2-dioxaborinane (111, 3.29 g, 21.39 mmol, Sigma-Aldrich) in a mixture of TBAF (30.0 mL) and THF (64.0 mL) under an argon atmosphere was added bis(triphenylphosphine)dichloropalladium(II) catalyst (Pd(PPh3)2Cl2, 1.33 g, 1.90 mmol, Sigma-Aldrich) and K2CO3 (8.20 g, 59.4 mmol). The resulting reaction mixture was heated to 60° C. and held for 16 hrs in a sealed bottle. The mixture was cooled to a temperature of about 25° C., diluted with water, and extracted with EtOAc. The organic layer was separated, washed with brine, and concentrated. The residue was chromatographed on a silica gel column eluted with EtOAc:hexanes to provide 3.2 g of 112 as a colorless oil (85% yield). 1H NMR (CDCl3) δ: 5.48 (1H, d, J=10.97 Hz), 5.83 (1H, d, J=17.62 Hz), 6.68 (1H, dd, J=10.97, 17.62 Hz), 7.52 (1H, d, J=1.60 Hz), 8.20 (1H, d, J=1.60 Hz). LC/MS (M+1): m/z=158.

후처리

  1. customThe resulting reaction mixture
  2. temperatureThe mixture was cooled to a temperature of about 25° C.
  3. extractionextracted with EtOAc
  4. customThe organic layer was separated
  5. washwashed with brine
  6. concentrationconcentrated
  7. customThe residue was chromatographed on a silica gel column
  8. washeluted with EtOAc

출처 및 근거

ORD 기록
ord-95e7cb6492904cd6a234fd63e09593ee
출처 데이터셋
uspto-grants-2016_03
특허 번호
US09273043B2

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