Abstract
13C cross-polarisation magic angle spinning NMR data have been reported for four derivatives of 4-aryl-octahydro-pyrido[1,2- c]pyrimidine-1,3-dione and the X-ray diffraction data for two (with 2′-Me and 2′-OMe). The crystal structures show the presence of centrosymmetric cyclic dimers with intermolecular C1O⋯H–N or C3O⋯H–N hydrogen bonds, the configuration at the chiral centres (C4 and C4 a) was determined as RR (SS). The twisting of aromatic ring at C4 with respect to the pyrido[1,2- c]pyrimidine skeleton is about 68–109°.
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