2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → HCID 22005043, compound

Participants

Reaction Steps

2.8 g (6.98 mmol) of 1,4-dihydro-2-cyclopentyl-6-ethyl-4-(4-fluorophenyl)pyridine-3,5-dicarboxylic acid-3-methylester-5-ethylester is dissolved in 100 ml of absol. methylene chloride, and after addition of 1.6 g (6.98 mmol) of 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), the mixture is stirred for 1 hour at room temperature. After this, it is drawn off by suction over diatomaceous earth and concentrated in a vacuum. The residue is chromatographed over silica gel (100 g of silica gel, 230-400 mesh, d 3.5 cm, mobile solvent ethyl acetate/petroleum ether 5:95).

Provenance & Evidence