反应详情

A mixture of intermediate (17) (0.048 mol) in DME (250 ml) was cooled on an ice bath and 2-methyl-2-propanol, potassium salt (0.096 mol) was added portionwise. The mixture was stirred at a low temperature for 15 min, poured out into ice water and acidified with HCl 3N. The precipitate was filtered off, washed with water, pasted up with CH3CN and diethyl ether, then dried, yielding 17.3 g (70%) of ethyl 4-(3-chlorophenyl)-1,2-dihydro-2-oxo-6-[(4-phenyl-2-thiazolyl)carbonyl]-3-quinolinecarboxylate (intermediate 18), mp 261° C.

1. temperaturewas cooled on an ice bath
2. filtrationThe precipitate was filtered off
3. washwashed with water
4. customdried