2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → HCID 13037307, compound

Participants

Reaction Conditions

Reaction Steps

2.58 g of 5-methyl-1,2,3,4-tetrahydro-β-carbolin-3-carboxylic acid ethyl ester is dissolved in 40 ml of absolute toluene, cooled to 15° C., 2.72 g of dichlorodicyanobenzoquinone is added thereto and the whole is stirred for 1 hour at this temperature. The mixture is then diluted with ethyl acetate, extracted several times by shaking with dilute ammonia and then with saturated common salt solution, dried over calcium sulphate and concentrated in vacuo. Chromatography on silica gel with a chloroform-ethanol gradient yields 1.56 g of 5-methyl-β-carbolin-3-carboxylic acid ethyl ester of melting point 221°-223° C. (decomposition).

Provenance & Evidence