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The title compounds were synthesized starting from homophthalic anhydride and a ketimine. The structure of 1'-methyl-1-oxo-2-(pyridine-3-yl-methyl)-2,4-dihydro-1H-spiro[isoquinoline-3,4'piperidine]-4-carboxylic acid was studied by X-ray analysis, ab initio and DFT calculations and the similarity between the conformation in crystalline hydrate state and in water solution was inferred. Derivatives of the parent compound were synthesized and studied by means of theoretical calculations.

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Synthesis of 1,2,3,4-substituted spiroheterocyclic tetrahydroisoquinoline-1-ones and their structural similarity in water solution and in crystallohydrate solid state