Potassium Phosphate, Tribasic → 2,6-Difluoro-3-(5-phenyl-thiazolo[5,4-b]pyridin-2-ylmethoxy)-benzamide

HRID 538581Notes

Reaction equation

HRID 538581 reaction equation
Br[C:2]1[N:7]=[C:6]2[S:8][C:9]([CH2:11][O:12][C:13]3[C:14]([F:23])=[C:15]([C:19]([F:22])=[CH:20][CH:21]=3)[C:16]([NH2:18])=[O:17])=[N:10][C:5]2=[CH:4][CH:3]=1.[C:24]1(B(O)O)[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>CN(C=O)C.O>[F:23][C:14]1[C:13]([O:12][CH2:11][C:9]2[S:8][C:6]3[C:5]([N:10]=2)=[CH:4][CH:3]=[C:2]([C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[N:7]=3)=[CH:21][CH:20]=[C:19]([F:22])[C:15]=1[C:16]([NH2:18])=[O:17]

Participants

6

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 66827Phenylboronic AcidHCID 866432773-(5-Bromo-thiazolo[5,4-b]pyridin-2-ylmethoxy)-2,6-difluoro-benzamide

Product 1

HCID 666200862,6-Difluoro-3-(5-phenyl-thiazolo[5,4-b]pyridin-2-ylmethoxy)-benzamideYield 41.1%

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 6228DimethylformamideSolvent

Conditions

Temperature
120 °C

Procedure

To a solution of 3-(5-bromo-thiazolo[5,4-b]pyridin-2-ylmethoxy)-2,6-difluoro-benzamide (0.20 g, 0.49 mmol) in 4 ml of DMF and water (2.0 ml) was added phenyl boronic acid (0.12 g, 0.99 mmol) and potassium phosphate (0.13 g, 0.59 mmol). The reaction mixture was degassed for 10 minutes followed by addition of dichlorobis(tri phenyl phosphine) palladium (II) (0.070 g, 0.099 mmol). The reaction mixture was heated at 120° C. for 2 h under the nitrogen atmosphere. After the completion of the reaction mixture (TLC monitoring), water (25 mL) was added and extracted with ethyl acetate (3×50 mL). The combined organics was washed with water, brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified over silica gel (100-200 M, 60% EtOAc-Hexane) to get the desired product (0.080 g, 41%) as a beige solid. 1H NMR (DMSO-d6, 400 MHz): δ 5.74 (s, 2H), 7.10 (m, 1H), 7.41-7.56 (m, 4H), 7.85 (m, 3H), 8.19 (m, 1H), 8.71 (br s, 1H) and 8.98 (br s, 1H). MS ES+(398.09), HPLC (method I) Rt=16.07 min.

Workup

  1. customThe reaction mixture was degassed for 10 minutes
  2. extractionextracted with ethyl acetate (3×50 mL)
  3. washThe combined organics was washed with water, brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude residue was purified over silica gel (100-200 M, 60% EtOAc-Hexane)

Sources & evidence

ORD record
ord-bed3e97b5c4c42d39491b113558a859d
Source dataset
uspto-grants-2014_10
Patent number
US08865736B2

Reaction notes

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