In article the new data is cited on reactions of cross-conjugated dienonic derivative of the alicyclic series (C₅, C₆) with hydrazines proceed to form trans-cyclanopyrazolines. The conditions and regiodirection of the reactions are determined by the alicycle's size and the peripheral substituent nature.
The conditions for the preparative synthesis of spiro-fused hydropyrimidinthiones based on carbonyl substrates and thiobarbituric acid were found. Schemes of condensation carbo- and heterocyclization are presented. Regio- and stereoselectiveness processes was established.
