Piperidine → 3-methyl-5,6,7,8-tetrahydropyrrolo[3,2-c]azepin-4(1H)-one

Participants

Reaction Steps

5-(2-Diethylamino-ethyl)-3-methyl-4-oxo-1,4,5,6,7,8-hexahydro-pyrrolo[3,2-c]azepine-2-carbaldehyde 1j (73 mg, 0.25 mmol) and 4-(2,3-difluoro-phenyl)-5-fluoro-1,3-dihydro-indol-2-one 74 g (60 mg, 0.23 mmol) were dissolved in 2 ml of ethanol, and added with 35 μl of piperidine to the solution at room temperature. Upon completion of the addition, the mixture was heated to reflux for 2 hours. After thin lay chromatography showed the disappearance of starting materials, the reaction mixture was naturally cooled to room temperature, and filtered. The filter cake was washed with anhydrous ethanol (3 ml×2) and dried to obtain the title compound (Z)-5-(2-(diethylamino)ethyl)-2-(4-(2,3-difluorophenyl)-5-fluoro-2-oxoindolin-3-ylidene)methyl)-3-methyl-5,6,7,8-tetrahydropyrrolo[3,2-c]azepin-4(1H)-one 74 (23 mg, yield 19%) as an orange solid.

Provenance & Evidence