Piperidine → (Z)-5-(2-diethylamino-ethyl)-2-(5-fluoro-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-3-methyl-6,7,8,9-tetrahydro-1H,5H-1,5-diaza-cyclopentacycloocten-4-one

Participants

Reaction Steps

5-(2-Diethylamino-ethyl)-3-methyl-4-oxo-4,5,6,7,8,9-hexahydro-1H-1,5-diaz a-cyclopentacyclooctene-2-carbaldehyde 60e (20 mg, 0.066 mmol) was dissolved in 1 ml of ethanol under stirring, and added with 5-fluoro-1,3-dihydro-indol-2-one (9.9 mg, 0.066 mmol) to the solution at room temperature. The reaction mixture was stirred in dark until dissolved, added with 0.1 ml of piperidine, and heated to reflux for 2 hours. After thin lay chromatography showed the disappearance of starting materials, the reaction mixture was naturally cooled down to room temperature, filtered to obtain the title compound (Z)-5-(2-diethylamino-ethyl)-2-(5-fluoro-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-3-methyl-6,7,8,9-tetrahydro-1H,5H-1,5-diaza-cyclopentacycloocten-4-one 60 (14 mg, yield 48.8%) as a yellow solid.

Provenance & Evidence