[C:1]([C:3]1[CH:8]=[CH:7][C:6]([O:9][CH3:10])=[CH:5][C:4]=1[CH3:11])#[CH:2].[Cl:12][C:13]1[C:14]([C:20]#[N:21])=[N:15][CH:16]=[C:17](Cl)[CH:18]=1.C(N(CC)CC)C.CN(C=O)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.CCOC(C)=O>[Cl:12][C:13]1[C:14]([C:20]#[N:21])=[N:15][CH:16]=[C:17]([C:2]#[C:1][C:3]2[CH:8]=[CH:7][C:6]([O:9][CH3:10])=[CH:5][C:4]=2[CH3:11])[CH:18]=1To a round bottom flask capped with septa was added 1-ethynyl-4-methoxy-2-methylbenzene (commercially available, 1.1 equiv.), 3,5-dichloropicolinonitrile (commercially available, 1 equiv.), triethylamine (5 equiv.), and anhydrous DMF (0.2 M). Vacuumed and nitrogen flushed for three times. CuI (0.05 equiv.) and bis(triphenylphosphine)dichloro-palladium(II) (0.05 equiv.) were added. The septum was replaced with a refluxing condenser and the flask was heated at 60° C. overnight under nitrogen atmosphere. Upon completion of the reaction as monitored by TLC, the content of the flask was loaded onto a large silica gel column pretreated with hexanes. Flash chromatography (silica gel, hexanes:EtOAc (1:4%)) afforded 3-chloro-5-((4-methoxy-2-methylphenyl)ethynyl)picolinonitrile.
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