Racemic Ethyl 6,7-Dimethoxy-3-hydroxymethylene-2-methyl-4-oxo-1,2,3,4-tetrahydroquinoline-1-carboxylate → 3-Propargylaminomethylene-6,7-dimethoxy-2-methyl-4-oxo-1,2,3,4-tetrahydro-1-quinoline carboxylic acid, ethyl ester

Participants

Reaction Steps

To 1.6 g. of 3-hydroxymethylene-6,7-dimethoxy-2-methyl-4-oxo-1,2,3,4-tetrahydro-1-quinoline carboxylic acid, ethyl ester in 15 ml. of benzene is added 275 mg. of proparglyamine, and the resulting solution allowed to stir overnight at room temperature. The reaction mixture is concentrated in vacuo to about 2 g. and is then dissolved in 50 ml. of chloroform. The resulting solution is washed with 50 ml. of a 1N aqueous sodium hydroxide solution and subsequently dried over magnesium sulfate. Removal of the chloroform solvent leaves 1.9 g. of the desired product as a yellow foam.

Provenance & Evidence