Tetrahydrofuran → 2-(3-Phenyl pyridin-4-yl)-5-(trifluoromethyl)benzoxazole

HRID 2094368Notes

Reaction equation

HRID 2094368 reaction equation
I[C:2]1[CH:3]=[N:4][CH:5]=[CH:6][C:7]=1[C:8]1[O:9][C:10]2[CH:16]=[CH:15][C:14]([C:17]([F:20])([F:19])[F:18])=[CH:13][C:11]=2[N:12]=1.[C:21]1(B(O)O)[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.O1CCCC1.[OH-].[Na+]>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>[C:21]1([C:2]2[CH:3]=[N:4][CH:5]=[CH:6][C:7]=2[C:8]2[O:9][C:10]3[CH:16]=[CH:15][C:14]([C:17]([F:20])([F:19])[F:18])=[CH:13][C:11]=3[N:12]=2)[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1

Participants

7

Reactant 4

HCID 8028TetrahydrofuranHCID 14798Sodium HydroxideHCID 66827Phenylboronic AcidHCID 668805972-(3-Iodopyridin-4-yl)-5-(trifluoromethyl)benzoxazole

Product 1

HCID 668806132-(3-Phenyl pyridin-4-yl)-5-(trifluoromethyl)benzoxazoleYield 26.5%

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 962WaterSolvent

Procedure

To a mixture of 0.78 g of 2-(3-iodopyridin-4-yl)-5-(trifluoromethyl)benzoxazole, 0.27 g of phenylboronic acid, 5 ml of tetrahydrofuran and 0.14 g of dichlorobis(triphenylphosphine)palladium (II), 3 ml of 10% aqueous solution of sodium hydroxide was added and heated to reflux for three hours. Water was added to the reaction mixture, followed by extraction with ethyl acetate twice. The combined organic layers were washed with water and a saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.18 g of 2-(3-phenyl pyridin-4-yl)-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 32”).

Workup

  1. additionwas added
  2. temperatureheated
  3. temperatureto reflux for three hours
  4. extractionfollowed by extraction with ethyl acetate twice
  5. washThe combined organic layers were washed with water
  6. dry with materiala saturated sodium chloride solution, dried over anhydrous magnesium sulfate
  7. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-3dc481d4c2d2411f9713da54e0441087
Source dataset
uspto-grants-2013_05
Patent number
US08445522B2

Reaction notes

Loading…