3-Bromo-2-methylpyrazolo[1,5-a]pyridine → HCID 66855938, compound

HRID 2282322Notes

Reaction equation

HRID 2282322 reaction equation
[CH2:1]([N:4]1[CH:8]=[CH:7][N:6]=[C:5]1[C:9]1[S:10][C:11]([Sn](CCCC)(CCCC)CCCC)=[CH:12][C:13]=1[C:14]1[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][C:15]=1[Cl:21])[CH:2]=[CH2:3].Br[C:36]1[C:37]([CH3:45])=[N:38][N:39]2[CH:44]=[CH:43][CH:42]=[CH:41][C:40]=12>CN(C=O)C.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>[CH2:1]([N:4]1[CH:8]=[CH:7][N:6]=[C:5]1[C:9]1[S:10][C:11]([C:36]2[C:37]([CH3:45])=[N:38][N:39]3[CH:44]=[CH:43][CH:42]=[CH:41][C:40]=23)=[CH:12][C:13]=1[C:14]1[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][C:15]=1[Cl:21])[CH:2]=[CH2:3]

Participants

5

Reactant 2

HCID 580948243-Bromo-2-methylpyrazolo[1,5-a]pyridineHCID 58095051HCID 58095051, compound

Product 1

HCID 66855938HCID 66855938, compound

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

To a solution of 1-allyl-2-[3-(2,4-dichlorophenyl)-5-(tributylstannyl)-2-thienyl]-1H-imidazole (180 mg, 0.29 mmol) in DMF (4.0 mL) was added [3-bromo-2-methylpyrazolo[1,5-a]pyridine (50 mg, 0.2 mmol) (azeotroped from toluene) and Bis(triphenylphosphine)palladium(II) chloride (8.5 mg, 0.012 mmol). The resulting mixture was degassed and stirred for 1 h at 100° C. under an atmosphere of argon. The reaction mixture was allowed to cool, concentrated and the residue was partially purified by silica gel column chromatography (40 g, eluting with 30% EtOAc in hexanes to EtOAc to give 3-[5-(1-allyl-1H-imidazol-2-yl)-4-(2,4-dichlorophenyl)-2-thienyl]-2-methylpyrazolo[1,5-a]pyridine, 82 mg. To a solution of [A] 3-[5-(1-allyl-1H-imidazol-2-yl)-4-(2,4-dichlorophenyl)-2-thienyl]-2-methylpyrazolo[1,5-a]pyridine (70 mg, 0.2 mmol), tetrakis(triphenylphosphine)palladium(0) (8.5 mg, 0.0074 mmol) and acetic acid (0.4 mL, 7 mmol) in DCM (1.5 mL) was added slowly phenylsilane (0.1 mL, 0.8 mmol) and the reaction mixture stirred at 40° C. for 2 h. The reaction mixture was concentrated and the product was purified by column chromatography on silica gel eluting with 1-3% MeOH in DCM. The product was further purified by preparative hplc, formic acid gradient. The title compound was isolated as a colorless lyophilized solid, 25 mg. LC/MS (FA) ES+ 425.0, 427.6, 428.4, 429.3. 1H NMR (400 MHz, d4-MeOH) δ: 8.48 (d, J=8.3 Hz, 1H), 7.85-7.87 (m, 1H), 7.50-7.60 (m, 1H), 7.31-7.39 (m, 3H), 7.18 (s, 1H), 7.04 (s, 2H), 6.90-6.95 (m, 1H), 2.62 (s, 3H).

Workup

  1. customThe resulting mixture was degassed
  2. temperatureto cool
  3. concentrationconcentrated
  4. customthe residue was partially purified by silica gel column chromatography (40 g
  5. washeluting with 30% EtOAc in hexanes to EtOAc

Sources & evidence

ORD record
ord-d35377f06bf449beb81f19638e55db3f
Source dataset
uspto-grants-2015_09
Patent number
US09139589B2

Reaction notes

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