Triethylamine → (E)-3-((7-chloro-3-(3-morpholino-3-oxoprop-1-enyl)imidazo[1,2-a]pyridin-2-yl)methyl)-1-cyclopropyl-1H-imidazo[4,5-c]pyridin-2(3H)-one

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A solution of 3-((7-chloro-3-iodoimidazo[1,2-a]pyridin-2-yl)methyl)-1-cyclopropyl-1H-imidazo[4,5-c]pyridin-2(3H)-one 12-a (prepared following the 3-step synthesis used for 7-b, using 4-chloro-2-aminopyridine instead of 2-aminopyridine in step 1) and Et3N (2.218 mL, 8 eq) in DMF (30 mL) was degassed with nitrogen for fifteen minutes. Then palladium acetate (45 mg, 0.1 eq), triphenylphosphine (173 mg, 0.33 eq) and 1-morpholinoprop-2-en-1-one (2.516 mL, 10 eq) were added and stirring in a closed vessel was allowed at 80° C. during two hours. After cooling the mixture was quenched with ice water. After one hour stirring the precipitate was filtered off and dried in vacuo. The solid was purified over silica with dichloromethane/methanol-NH3 98/2 as eluent to provide the target compound P24 in 92% yield (884 mg). m/z=479 (M+H)+;

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