Liliya I. Kasyan

Acylation of Aminopyridines and Related Compounds with Endic Anhydride

Reactions of bicyclo[2.2.1]hept-5-ene-endo-2,endo-3-dicarboxanhydride (endic anhydride) with 2-, 3-, and 4-aminopyridines, 3-hydroxy- and 5-iodo-2-aminopyridines, 6-aminoquinoline, and 6-aminoquinoxaline involve chemoselective transformation of the exocyclic amino group. The resulting amido acids were converted into the corresponding carboximides, and the latter were epoxidated with peroxy acids. The structure of the products was confirmed by the IR, UV, and 1H and 13C NMR spectra, as well as by calculation of the 1H and 13C chemical shifts using the GIAO method (B3LYP/6-31G** approximation).

Reaction of endic anhydride with hydrazines and acylhydrazines

Reaction products of bicyclo[2.2.1]hept-2-ene-endo,endo-5,6-dicarboxylic (endic) acid with hydrazines and acylhydrazines were prepared. The features distinguishing of these reactions from those with amines were revealed. The compounds obtained were characterized by 1H, 13C NMR, and IR spectra. The assignment of the signals in NMR spectra was done with the use of quantum-chemical calculations of chemical shifts performed by the density functional method. The structure of one among compounds synthesized, N-(m-hydroxybenzoylamino)-bicyclo[2.2.1]hept-2-ene-endo,endo-5,6-dicarboxamide, was proved by X-ray diffraction analysis.

Synthesis and some reactions of new N-[aryl(benzyl cyclohexyl, propyl)sulfonyl]-4-azatricyclo[5.2.1.02,6]dec-8-enes

A synthesis was accomplished of 4-azatricyclo[5.2.1.02,6]dec-8-ene by aminolysis of bicyclo[2.2.1]hept-2-ene-endo,endo-5,6-dicarboxylic acid anhydride followed by transformation of amidoacid into imide that was subsequently reduced by lithium aluminum hydride. The reaction of the key tricyclic amine with sulfonyl chlorides afforded N-[aryl(benzyl, cyclohexyl, propyl)sulfonyl]-4-azatricyclo[5.2.1.02,6]dec-8-enes.The sulfonamides were subjected to epoxidation with perphthalic acid. By reaction of sulfonamides with p-nitrophenyl azide triazolines were obtained. The structure of compounds synthesized was confirmed by IR, 1Hand 13 NMR spectra.

exo-2,3-Epoxybicyclo[2.2.1]heptan-endo-5,6-dicarboximides: versatile starting materials for the preparation of oxazaheterocyclic cage compounds

A convenient method is reported for the synthesis of N-substituted exo-2-hydroxy-6-aza-4-oxatetracyclo[5.2.1.13,508,9]undecan-7-ones, exo-2-hydroxy-6-aza-4-oxatetracyclo[5.2.1.13,508,9]undecanes, and endo-8,exo-9-dihydroxy-4-azatricyclo[5.2.1.02,6]decanes in high to moderate yields. The method involves treatment of easily available exo-2,3-epoxybicyclo[2.2.1]heptan-endo-5,6-dicarboximides with LiAlH4.Graphical abstract

Phase-transfer Catalysis in Alkylation of Ureas Containing Cage-like Fragments

Nitrogen-containing compounds with cage-like fragments of norbornene, norbornane, and adamantane exhibit antiviral [1] and neurotropic [2] activity and thus are promising models for investigation of relations between the biological activity and the structure and stereochemistry of molecules. In the recent years the synthesis of these compounds is currently performed with the use of phase-transfer catalysis which plays a significant part in reactions with high sterical requirements to attacking reagents. Methods were developed for arylsulfonylation of amines [3], of alkylation and acylation of sulfonamides from the norbornene series [4].