Heterocyclic compounds of the pyrazole series with several functional substituents in the ring are of great interest for synthetic investigations [1-3]. Of particular value in our opinion are the pyrazoles containing electrophilic groups (eg, formyl or nitrile). The former, in particular, can be used successfully in various forms d the pyrazole ring annellation [4], while the latter can be used to create an assembly of rings with an azole unit, especially if they are attached to ...
