3-Amino-1,2,4-triazine → HCID 20071616, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 11.3 g of ethyl 2-(2,7-dichloro-6-fluoroquinoline-3-carbonyl)-3-dimethylaminoacrylate and 5.65 g of 3-amino-1,2,4-triazine in 60 cm3 of trichloromethane is stirred for 16 hours at a temperature close to 20° C. The reaction mixture is concentrated to dryness under reduced pressure (20 kPa) at a temperature close to 30° C. The residue is taken up in 60 cm3 of ethanol and 5.6 g of DBU and the mixture is heated at a temperature close to 75° C. for 20 hours. After cooling to 20° C., the insoluble matter is drained and washed with twice 40 cm3 of ethanol. 6.1 g of 8-chloro-3-ethoxycarbonyl-7-fluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine are obtained in the form of a brown solid which decomposes at 378°-380° C. and is used for the subsequent steps without further purification.

Provenance & Evidence