C1(P(C2CCCCC2)C2C=CC=CC=2C2C(OC)=CC=CC=2OC)CCCCC1.C([Zn][C:33]#[N:34])#N.Cl[C:36]1[N:41]=[CH:40][C:39]([OH:42])=[CH:38][C:37]=1[CH3:43]>CN(C=O)C.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[OH:42][C:39]1[CH:38]=[C:37]([CH3:43])[C:36]([C:33]#[N:34])=[N:41][CH:40]=1
A resealable vessel was charged with Pd2dba3 (0.893 g, 0.975 mmol, Strem), dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine (0.858 g, 2.090 mmol, Strem), dicyanozinc (1.636 g, 13.93 mmol), and 6-chloro-5-methylpyridin-3-ol (2.00 g, 13.93 mmol, step 3 intermediate 34). The solids were taken up in DMF (45 mL) and the reaction mixture was purged with Argon. The vessel was sealed and heated in a 110° C. oil bath. After 21 h, the reaction was filtered through Celite and the filter cake was rinsed with 5% MeOH-DCM. The filtrate was concentrated and the residue was purified by silica gel chromatography, eluting with 40% to 50% EtOAc-hexane to afford the title compound (676 mg, 32%). MS m/z=135 (M+H)+.
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