1 Department of Organic Chemistry, Slovak Technical University, SK-81237 Bratislava, Slovak Republic 2 Institute of Chemistry, Slovak Academy of Sciences, SK-84238 Bratislava, Slovak Republic 3 Department of Organic Chemistry, Masaryk University, CZ-61137 Brno, Czech Republic 4 Faculty of Chemistry, Technical University Brno, CZ-63700 Brno, Czech Republic ... Summary. Treatment of easily available 2-formyl-1,4-dihydropyridines with 3-oxo-3- ...