| 摘要 |
1337377 Dioxoloquinoline carboxylic acid ester preparation WARNER LAMBERT CO 26 June 1972 [20 July l9 29847/72 Heading C2C Ethyl 8 - hydroxy - 1,3 - dioxolo[4,5-g]- quinoline-7-carboxylate is prepared by (a) reacting ethanol and P 2 O 5 in xylene at below 120‹ C.; (b) adding diethyl (3,4-methylenedioxyphenyl)-aminomethylene malonate; (c) heating the mixture at 138-140‹ C. for one hour; (d) cooling the mixture; (e) pouring the mixture into a base and (f) recovering the precipitate. |
