Ethyl 2-chloro-1,3-oxazole-5-carboxylate → HCID 59564714, compound

HRID 880387Notes

Reaction equation

HRID 880387 reaction equation
Cl[C:2]1[O:3][C:4]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[CH:5][N:6]=1.[Cl:12][C:13]1[CH:21]=[C:20]2[C:16]([CH:17]=[N:18][N:19]2[S:22]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)(=[O:24])=[O:23])=[C:15]([Sn](C)(C)C)[CH:14]=1>CN(C)C=O.[Cu]I>[Cl:12][C:13]1[CH:21]=[C:20]2[C:16]([CH:17]=[N:18][N:19]2[S:22]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)(=[O:23])=[O:24])=[C:15]([C:2]2[O:3][C:4]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[CH:5][N:6]=2)[CH:14]=1

Participants

5

Reactant 2

HCID 26369855Ethyl 2-chloro-1,3-oxazole-5-carboxylate3×HCID 595647036-Chloro-1-(phenylsulfonyl)-4-(trimethylstannyl)-1H-indazole3×

Product 1

HCID 59564714HCID 59564714, compoundYield 39.3%

Reagents, catalysts & solvents 2

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)Catalyst3×HCID 6228DimethylformamideSolvent3×

Conditions

Temperature
100 °C

Procedure

In 4 batches, tetra is(triphenylphosphine)palladium(0) (3.37 g, 2.92 mmol), ethyl 2-chloro-1,3-oxazole-5-carboxylate (6.65 g, 37.9 mmol, available from Apollo Scientific) and copper(I) iodide (1.11 g, 5.83 mmol) were added to a solution of 6-chloro-1-(phenylsulfonyl)-4-(trimethylstannanyl)-1H-indazole (13.28 g, 29.2 mmol) in N,N-dimethylformamide (52 ml). In 3 of the batches, tetra is(triphenylphosphine)palladium(0) (1.03 g, 0.89 mmol), ethyl 2-chloro-1,3-oxazole-5-carboxylate (2.03 g, 11.59 mmol) and copper(I) iodide (0.34 g, 1.78 mmol) were added to a solution of 6-chloro-1-(phenylsulfonyl)-4-(trimethylstannanyl)-1H-indazole (4.06 g, 8.91 mmol) in N,N-dimethylformamide (16 ml). In the fourth batch, tetra is(triphenylphosphine)palladium(0) (0.28 g, 0.24 mmol), ethyl 2-chloro-1,3-oxazole-5-carboxylate (0.55 g, 3.14 mmol) and copper(I) iodide (0.09 g, 0.48 mmol) were added to a solution of 6-chloro-1-(phenylsulfonyl)-4-(trimethylstannanyl)-1H-indazole (1.10 g, 2.42 mmol) in N,N-dimethylformamide (4 ml). Each batch was heated and stirred at 100° C. under microwave irradiation for 30 min. The mixtures were allowed to cool to RT and the combined precipitated product suspended in diethyl ether and collected by filtration, washing with further diethyl ether then drying in a vacuum oven for 72 h. Approximately 5.2 g of the resultant solid was dissolved in dichloromethane and passed through Celite, eluting with further dichloromethane. The solvent was evaporated in vacuo to give the title compound as a pale orange solid (4.95 g).

Workup

  1. temperatureEach batch was heated
  2. temperatureto cool to RT
  3. customthe combined precipitated product
  4. filtrationcollected by filtration
  5. washwashing with further diethyl ether
  6. customthen drying in a vacuum oven for 72 h
  7. dissolutionApproximately 5.2 g of the resultant solid was dissolved in dichloromethane
  8. washeluting with further dichloromethane
  9. customThe solvent was evaporated in vacuo

Sources & evidence

ORD record
ord-860f51be83284ca4a697bcfe72244762
Source dataset
uspto-grants-2015_03
Patent number
US08993576B2

Reaction notes

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