A generally applicable multicomponent method has been established for the synthesis
of pyridines. In the reactions, thioacetamide is used as a cheap and efficient ammonium
source in a multicomponent reaction with aldehydes and electron-deficient enamines
or alkynes to give 3,4,5-trisubstituted pyridines in moderate to good yields and with
a high product diversity.
Key words
multicomponent reactions - ring closure - pyridines - aldehydes - enamines - alkynes