Process for preparation of 4H-4-oxo-quinolizine-3-carboxylic acid
 A process for the preparation of a compound having the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are defined, from an enamine by chain expansion and ring closure followed by additional derivatization, treatment with a 3-alkoxyl-acryloyl compound, another ring closure, and converting a hydroxyl group to a leaving group. 
Abbott Laboratories
C
C07D
inventional
Francis A. J. Wei-Bo Chi-Nung W. Qun Daniel T.
Kerdesky Wang Hsiao Li Chu