Institute for Organic Chemistry, Technical Universitya, GellCrt tCr 4, H-1521 Budapest, Hungary, Central Research Institute for Chemistry of the Hungarian Academy of Sciences b, H-1525 Budapest, Hungary, and Chinoin Pharmaceutical and Chemical Works Ltd. c, H-1045 Budapest, Hungary ... The application of thiazolium salt catalysed addition of aldehydes to a, b-unsaturated esters for the synthesis of the title compounds (1, 2 and 3) is discussed.
