Trifluoroacetylpiperazine → 8-(4-trifluoroacetyl-1-piperazinyl)-9-chloro-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid

Participants

Reaction Steps

A mixture of 4.5 g of 8-(p-toluenesulfonyloxy)-9-chloro-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid, 9.1 g of 1-trifluoroacetylpiperazine and 200 ml of anhydrous dimethyl sulfoxide was heated with stirring in an autoclave at 150° to 160° C. for 17 hours under nitrogen gas flow at a pressure of 10 atms. The reaction mixture was treated in the same manner as Example 73 to obtain 2.3 g of 8-(4-trifluoroacetyl-1-piperazinyl)-9-chloro-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid as white rhombic crystals having a melting point of 300° C. or more.

Provenance & Evidence