Tri-tert-butylphosphine tetrafluoroborate → Ethyl 3-(3-(5-(3,4-difluorobenzylcarbamoyl)-2-fluorophenylcarbamoyl)imidazo[1,2-a]pyridin-7-yl)propanoate

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7-Bromo-N-(5-(3,4-difluorobenzylcarbamoyl)-2-fluorophenyl)imidazo[1,2-a]pyridine-3-carboxamide (Intermediate 3A) (1 g, 1.987 mmol), Pd2(dba)3 (0.091 g, 0.099 mmol) and tritertbutylphosphonium tetrafluoroborate (0.058 g, 0.199 mmol) were combined in THF (60 ml) under nitrogen and the mixture was degassed thoroughly refilling with nitrogen (×3). (3-Ethoxy-3-oxopropyl)zinc(II) bromide (19.87 ml, 9.93 mmol) was added and the mixture was heated at 60° C. for 100 mins. After cooling to RT, the mixture was absorbed onto silica and purification by chromatography eluting with 0-6% MeOH in DCM afforded a yellow oil which was triturated with EtOAc to give the title compound;

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