| abstract |
Pyridoindole derivatives of formula <IMAGE> (I) n=0 or 1; R1=H, Hal, alk, alk-O-, CF3; R2=-COOalk; -CONHR5 (R5=H or various substituents); R3=H, alk, -COOalk; R4=H, Ac, alk, -CONHR6 (R6=H or various substituents), and acid addition salts, except certain known compounds, are useful in treating anoxia and depression and in psychotropic therapy. They are prepared from tryptamine or a derivative thereof by reaction thereof with a pyruvic ester or 3-ethoxycarbonyl-1,2-dioxo-1-ethoxypropane to form compounds in which R4 is H and R2 is -COOalk. These compounds are reacted with amines, isocyanates or usual N-acylating or N-alkylating reagents to prepare the other compounds. |