Cl[C:2]1[N:7]=[C:6]([O:8][CH3:9])[CH:5]=[CH:4][N:3]=1.[C:10]([Si:12]([CH3:15])([CH3:14])[CH3:13])#[CH:11].C(N(CC)CC)C>[Cu]I.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.O1CCCC1>[CH3:9][O:8][C:6]1[CH:5]=[CH:4][N:3]=[C:2]([C:11]#[C:10][Si:12]([CH3:15])([CH3:14])[CH3:13])[N:7]=1
An oven-dried resealable Schlenk tube was charged with 2-chloro-4-methoxypyrimidine (2.60 g, 17.99 mmol), ethynyltrimethylsilane (3.05 mL, 21.58 mmol), tetrahydrofuran (24 mL) and triethylamine (12.53 mL, 89.90 mmol). The Schlenk tube was subjected to three cycles of evacuation-backfilling with argon and then copper(I) iodide (0.14 g, 0.72 mmol) and bis(triphenylphosphine)palladium(II) dichloride (0.51 g, 0.72 mmol) were added. After three further cycles of evacuation-backfilling with argon, the Schlenk tube was sealed and the mixture was stirred and heated in an oil bath at 90° C. After 16 hours, the mixture was filtered and the solvent was removed under reduced pressure. The residue was taken up in a mixture of ethyl acetate and water and the organic layer was separated, washed with 4% aqueous sodium hydrogencarbonate solution, dried (MgSO4) and evaporated. Purification of the residue by flash chromatography (9:1 hexane/ethyl acetate) gave the title compound (2.85 g, 77%) as an oil.
Wird geladen…
