TRANSFORMATIONS OF SUBSTITUTED OXAZOLO[3,2- a ]PYRIDINES TO 5,6-DISUBSTITUTED INDOLIZINES: SYNTHESIS AND X-RAY STRUCTURAL MAPPING

The treatment of 4,6-dimethyl-2-oxonicotinic nitrile, amide, and ethyl ester with p-bromophenacyl bromide produced N-alkyl isomers, which cyclized in the presence of mineral acids to the oxazolo[3,2‑ a ]pyridinium cations without changes in the functional groups. The obtained compounds underwent recyclization to 6-Х-5-aminoindolizines (X = CN, CONH 2 , CO 2 Et) upon treatment with morpholine. The compounds were characterized by X-ray structural analysis. How to Cite Rybakov, V. B.; Babaev, E. V. Chem. Heterocycl. Compd. 2014 , 50 , 225. [ Khim. Geterotsikl. Soedin. 2014 , 250.] For this article in the English edition see DOI 10.1007/s10593-014-1465-8