Tert-butyl 4-(trifluoromethanesulfonyloxy)-1,2,3,6-tetrahydropyridine-1-carboxylate → tert-butyl 3-methyl-3',6'-dihydro-2,4'-bipyridine-1'(2'H)-carboxylate

HRID 490181노트

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HRID 490181 반응식
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH:12]=[C:11](OS(C(F)(F)F)(=O)=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[Br-].[CH3:23][C:24]1[C:25]([Zn+])=[N:26][CH:27]=[CH:28][CH:29]=1>O1CCCC1.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH3:23][C:24]1[C:25]([C:11]2[CH2:10][CH2:9][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH2:13][CH:12]=2)=[N:26][CH:27]=[CH:28][CH:29]=1

참가 물질

5

반응물 2

HCID 10991161Tert-butyl 4-(trifluoromethanesulfonyloxy)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 178426320HCID 178426320, 화합물

생성물 1

HCID 22729481tert-butyl 3-methyl-3',6'-dihydro-2,4'-bipyridine-1'(2'H)-carboxylate수율 82%

시약·촉매·용매 2

HCID 11979704Tetrakis(triphenylphosphine)palladium촉매HCID 8028Tetrahydrofuran용매

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온도
70 °C

실험 절차

A solution of 4-trifluoromethanesulfonyloxy-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (8.10 g, 24.8 mmol; Bursavich, M. G.; et al. Org. Lett. 2001, 3, 2317) in tetrahydrofuran (50 mL) was treated with 3-methyl-2-pyridylzinc bromide (0.5 M in tetrahydrofuran, 65.0 mL, Aldrich), tetrakis(triphenylphosphine)-palladium(0) (280 mg, 0.24 mmol) and the mixture heated to 70° C. for 2 hours. The mixture was cooled to room temperature, concentrated under reduced pressure, the residue taken up in dichloromethane and washed with 1N sodium hydroxide. The organic phase was dried (magnesium sulfate), filtered and concentrated under reduced pressure. The residue was purified by flash column chromatography on silica gel (elution with 50% ethyl acetate: hexanes) to provide 5.50 g (82% yield) of the title compound as a light yellow oil. 1H NMR (300 MHz, DMSO-d6) δ 1.44 (s, 9H), 2.32 (s, 3H), 2.44 (m, 2H), 3.54 (m, 2H), 3.99 (m, 2H), 5.88 (br s, 1H), 7.17 (dd, 1H, J=7.8, 4.8 Hz), 7.62 (br d, 1H, J=7.5 Hz), 8.36 (dd, 1H, J=4.8, 1.7 Hz); MS (DCI/NH3) m/e 275 (M+H)+; 292 (M+NH4)+.

후처리

  1. temperatureThe mixture was cooled to room temperature
  2. concentrationconcentrated under reduced pressure
  3. washwashed with 1N sodium hydroxide
  4. dry with materialThe organic phase was dried (magnesium sulfate)
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified by flash column chromatography on silica gel (elution with 50% ethyl acetate: hexanes)

출처 및 근거

ORD 기록
ord-ac59f644ae794770b5a43fdf930c127d
출처 데이터셋
uspto-grants-2009_05
특허 번호
US07528134B2

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