Methyl chloroformate → HCID 12805006, compound

Participants

Reaction Steps

6.0 g (31.7 millimoles) of 6-(p-aminophenyl)-4,5-dihydro-3(2H)-pyridazinone and 3.3 g (34.9 millimoles) of methyl chloroformate in 100 ml of absolute toluene are kept for 6 hours at 80° C. The product is filtered off at 10° C., washed first with toluene and then with water, and recrystallized from dimethylformamide/water. 3.3 g (42% of theory) of 4,5-dihydro-6-(p-methoxycarbonylaminophenyl)-3(2H)-pyridazinone are obtained as beige crystals, of melting point 246°-247° C. (with decomposition).

Provenance & Evidence