Nucleophilic addition reactions to nitrilium derivatives [B12H11NCCH3]- and [B12H11NCCH2CH3]-. Synthesis and structures of closo-dodecaborate-based iminols, amides and amidines.

The synthesis of the acetonitrilium and propionitrilium derivatives of closo-dodecaborate [B12H12]2- was discussed. The nucleophilic addition reactions of water, alcohols and secondary amines to the activated triple bond of the nitrilium derivatives yielded the corresponding iminols, imidates and amidines. The obtained results were supported by X-ray diffraction studies and DFT calculations.

A Novel Heterocyclic System Based on Natural Epoxyalantolactone.

Natural sesquiterpene lactones which contain an exocyclic methylene group in the ß-position of the lactone ring react readily with N-nucleophiles. When studying the reaction of the natural epoxyalantolactone with the primary amines we demonstrate the formation of a new heterocyclic system-the hydrogenated benzo[g]furo[4,3,2-cd]indol-3(1H)-one. Spectral data on the characteristics of the synthesized compounds are presented. The data on the reaction mechanisms and its applicability for the preparation are discussed.