[CH2:1]([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][N:8]=[C:7](Cl)[C:6]=1[Cl:12])[CH3:2].[C:14]([O-])([O-])=O.[K+].[K+].CB1OB(C)OB(C)O1.O>O1CCOCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:1]([O:3][C:4](=[O:13])[C:5]1[CH:10]=[CH:9][N:8]=[C:7]([CH3:14])[C:6]=1[Cl:12])[CH3:2]A mixture of 2,3-dichloroisonicotinic acid ethyl ester (3.15 mmol), K2CO3 (4.73 mmol) and trimethylboroxine (3.15 mmol) in 4 mL dioxane was degassed with Ar. Then, tetrakis(triphenylphosphine)palladium (0.31 mmol) was added and the mixture was heated to reflux overnight. At RT, the reaction mixture was poured into water and extracted with DCM. The combined organic layers were dried over K2CO3, filtered over a pad of celite and concentrated in vacuo. Purification by CC (KP-SIL™ from Biotage) using Hept/EtOAc (8/2) gives the desired product as brown oil;
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