Cesium carbonate → Dicyclohexyl(2',6'-dimethoxy[1,1'-biphenyl]-2-YL)phosphine oxide

HRID 1667547

Reaction equation

HRID 1667547 reaction equation
BrC1C=CC=CC=1[O:8]C.C(=O)([O-])[O-].[Cs+].[Cs+].[CH:16]1([P:22]([CH:39]2[CH2:44][CH2:43][CH2:42][CH2:41][CH2:40]2)[C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][C:24]=2[C:29]2[C:34]([O:35][CH3:36])=[CH:33][CH:32]=[CH:31][C:30]=2[O:37][CH3:38])[CH2:21][CH2:20][CH2:19][CH2:18][CH2:17]1.O.NN>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C(OCC)(=O)C.O.CO.O1CCOCC1>[CH:39]1([P:22]([CH:16]2[CH2:21][CH2:20][CH2:19][CH2:18][CH2:17]2)([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][C:24]=2[C:29]2[C:34]([O:35][CH3:36])=[CH:33][CH:32]=[CH:31][C:30]=2[O:37][CH3:38])=[O:8])[CH2:40][CH2:41][CH2:42][CH2:43][CH2:44]1

Participants

10

Reactant 4

HCID 10796Cesium carbonateHCID 113582-BromoanisoleHCID 24654Hydrazine hydrate (1:1)HCID 112698722-Dicyclohexylphosphino-2',6'-dimethoxybiphenyl

Product 1

HCID 67122844Dicyclohexyl(2',6'-dimethoxy[1,1'-biphenyl]-2-YL)phosphine oxideYield 45.4%

Reagents, catalysts & solvents 5

HCID 167845palladium(II) acetateCatalystHCID 887MethanolSolventHCID 962WaterSolvent2×HCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
95 °C

Procedure

To the mixture of 2-bromoanisole (0.020 ml, 0.16 mmol) and 1,4-dioxane (2 ml), water (0.2 ml), cesium carbonate (0.32 g, 0.97 mmol), sodium 1,3-dioxo-1,3-dihydro-isoindole-2-ylmethyl trifluoroborate (81 mg, 0.32 mmol), palladium(II) acetate (3.6 mg, 0.016 mmol), and 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (13 mg, 0.032 mmol) were added, and then the obtained reaction mixture was stirred at 95° C. (an outer temperature) overnight. The reaction mixture was cooled to room temperature, and then hydrazine hydrate (0.039 ml, 0.81 mmol) and methanol (2 ml) were added thereto, followed by heating to reflux for 1 hour. The reaction mixture was cooled to room temperature, and then water and ethyl acetate were added to the reaction mixture, followed by filtration with celite. The organic layer of the filtrate was separated and washed with saline. The solvents were evaporated under reduced pressure from the organic layer, and then the obtained residue was purified with NH-silica gel column chromatography (heptane:ethyl acetate=1:4), thereby obtaining the entitled compound (4.1 mg, 19%) as the mixture with 2′-(dicyclohexyl-phosphinoyl)-2,6-dimethoxy-biphenyl (6.2 mg).

Workup

  1. additionwere added
  2. customthe obtained reaction mixture
  3. temperatureThe reaction mixture was cooled to room temperature
  4. temperatureby heating
  5. temperatureto reflux for 1 hour
  6. temperatureThe reaction mixture was cooled to room temperature
  7. filtrationfollowed by filtration with celite
  8. customThe organic layer of the filtrate was separated
  9. washwashed with saline
  10. customThe solvents were evaporated under reduced pressure from the organic layer
  11. customthe obtained residue was purified with NH-silica gel column chromatography (heptane:ethyl acetate=1:4)

Sources & evidence

ORD record
ord-25d15210b343474e92123f89449e1d9a
Source dataset
uspto-grants-2011_10
Patent number
US08044216B2

Linked notes

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