регіоселективність

N-allyl(cinnamyl)substituted derivatives of 6-methyluracil were synthesized. The reactions of their bromo- and iodocyclization were performed which led to the formation of the derivatives of dihydro¬oxazolo¬pyrimidinium and dihydrooxazinepyrimidinium. The factors that favor the regioselectivity of these reactions were suggested.

Reactions of nucleophilic substitution between 5-R-2,3-dichloro-1,4-naphthoquinones and 4-amino-5- heteryl-4H-1,2,4-triazoles-3-thiols were carried out. It is shown that the interaction can take place in two alternative ways and the reaction direction is controlled by reaction conditions. Search of differences in atoms reactivity in investigated molecules by comparing the calculated Fukui atonic indices was conducted.