Abstract
AbstractThe 6‐(2‐nitrostyryl)‐2H‐pyran‐2‐ones 1 were reduced with hydrogen over Pd/C at room temperature and atmospheric pressure giving the 2‐benzoylamino‐4‐(1,2,3,4‐tetrahydro‐2‐quinolinylidene‐2‐pentenedioic acid derivatives 2 which were converted, without isolation, into the 5,6‐dihydro‐1H‐benzo[c]quinolizin‐1‐ones 4 in refluxing acetic anhydride. When α‐aminoacids 2 were treated with acetic anhydride at room temperature oxazolones 3 were isolated, while by heating quinolizines 4 were found. Compounds 3 were transformed into 4 in refluxing acetic acid or anhydride.
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