A series of amino derivatives of 5-arylisoxazoles and 4,5-dichloroisothiazole with primary and secondary amino groups was synthesized. 3-Aminomethyl-5-arylisoxazol-3-ylmethanamines were obtained on the basis of 5-aryl-3-(chloromethyl)isoxazoles using the Gabriel phthalimide method. 5-Arylisoxazol-3-yl- and 4,5-dichloroisothiazol-3-ylallylamines were synthesized in two ways: reduction of azomethines obtained by condensation of 5-arylisoxazolyl- and 4,5-dichloroisothiazolyl-3-carbaldehydes with allylamine, and by nucleophilic substitution of the chlorine atom in 3-chloromethyl derivatives of the corresponding azoles by reaction with allylamine. Amides and sulfonamides of azolylallylamines were synthesized. Some of the compounds obtained showed antibacterial and fungicidal activity.

The chiral title compounds, C₂₁H₁₈N₂O₂, (I), and C₂₁H₁₈N₂OS, (II) – products of the three-component reaction between benzylamine, isatoic anhydride and furyl- or thienyl-acrolein – are isostructural and form isomorphous racemic crystals. The tetrahydropyrimidine ring in (I) and (II) adopts a sofa conformation. The amino N atom has a trigonal–pyramidal geometry [sum of the bond angles is 347.0° for both (I) and (II)], whereas the amido N atom is flat [sum of the bond angles is 359.3° for both (I) and (II)]. The furyl- and thienylethenyl substituents in (I) and (II) are planar and the conformation about the bridging C=C bond isE. These bulky fragments occupy the axial position at the quaternary C atom of the tetrahydropyrimidine ring, apparently, due to steric reasons. In the crystals, molecules of (I) and (II) form hydrogen-bonded helicoidal chains propagating along [010] by strong intermolecular N—H...O hydrogen bonds.