p-Toluenesulfonic acid → HCID 59226521, compound

HRID 1920214Notes

Reaction equation

HRID 1920214 reaction equation
[N+:1]([C:4]1[CH:5]=[N:6][CH:7]=[CH:8][C:9]=1[C:10]1[CH2:15][CH2:14][CH2:13][CH:12](O)[CH:11]=1)([O-:3])=[O:2].O1CCOCC1.CC1C=CC(S(O)(=O)=O)=CC=1.C([O-])(O)=O.[Na+]>C(OCC)(=O)C>[C:10]1([C:9]2[CH:8]=[CH:7][N:6]=[CH:5][C:4]=2[N+:1]([O-:3])=[O:2])[CH2:15][CH2:14][CH:13]=[CH:12][CH:11]=1

Participants

6

Reactant 4

HCID 6101p-Toluenesulfonic acidHCID 312751,4-DioxaneHCID 516892Sodium BicarbonateHCID 59226486HCID 59226486, compound

Product 1

HCID 59226521HCID 59226521, compoundYield 27%

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
100 °C

Procedure

To a solution of 3-(3-nitropyridin-4-yl)cyclohex-2-enol (1.0 equiv.) was added dioxane (0.18M) and p-TSA (1.1 equiv.). The solution was heated to 100° C. for 4 h. Cooled to room temperature, worked up with sat. NaHCO3 and ethyl acetate, the organic phase was dried with Na2SO4 and concentrated. The crude was purified via silica gel column chromatography eluting with 100% DCM to give 4-(cyclohexa-1,3-dienyl)-3-nitropyridine as a yellow oil (27% yield). LCMS (m/z): 203.1 (MH+), LC Rt=3.53 min, H-NMR (CDCl3): 9.02 (s, 1H), 8.70 (d, J=5.3, 1H), 7.30 (d, J=5.3, 1H), 6.15-6.17 (m, 1H), 6.02-6.11 (m, 2H), 2.35-2.38 (m, 4H).

Workup

  1. temperatureCooled to room temperature
  2. dry with materialthe organic phase was dried with Na2SO4
  3. concentrationconcentrated
  4. customThe crude was purified via silica gel column chromatography
  5. washeluting with 100% DCM

Sources & evidence

ORD record
ord-1685acc45b7e4769b59ce3e227c8c067
Source dataset
uspto-grants-2012_05
Patent number
US08168794B2

Reaction notes

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