Crystal structure of ethyl 6-methyl-2-oxo-4-(3,4,5-trimethoxyphenyl)-1,2,3,4-tetrahydropyrimidine-5-carboxylate

Abstract

In the title compound, C17H22N2O6, the di­hydro­pyrimidine ring adopts a flattened boat conformation. The dihedral angle between the benzene ring and the mean plane of the di­hydro­pyrimidine ring is 75.25 (6)°. In the crystal, mol­ecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R 2 2(8) ring motif which are linked through N—H⋯O and weak C—H⋯O hydrogen bonds. These, together with π–π ring inter­actions [centroid–centroid distance = 3.7965 (10) Å], give an overall three-dimensional structure.

Ethyl 4-(furan-2-yl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate: a triclinic polymorph

“…As part of our studies in this area, we have determined the crystal structure of the title compound presented herein. It is one of the analogues of our previously reported DHPM structures (Suresh et al, 2015a,b;Novina et al, 2015).…”

Crystal structure of ethyl 6-chloromethyl-2-oxo-4-(2,3,4-trimethoxyphenyl)-1,2,3,4-tetrahydropyrimidine-5-carboxylate

“…In comparison, this dihedral angle in the structure of ethyl 6-ethoxycarbonylmethyl-4-(2-hydroxyphenyl)-2-oxo-1,2,3,4tetrahydropyrimidine-5-carboxylate, (II), is 87.7 (2) (Kettmann et al, 2008), in ethyl-6-(chloromethyl)-4-(4-chlorophenyl)-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate, (III), it is 87.08 (9) (Bharanidharan et al, 2014), and in the crystal structure of ethyl 6-methyl-2-oxo-4-(3,4,5-trimethoxyphenyl)-1,2,3,4-tetrahydropyrimidine-5-carboxylate, (IV), it is 75.25 (6) (Novina et al, 2015). The ethyl acetate group attached to the pyrimidine ring shows an extended conformation [torsion angle C12-C15-O2-C16 = À175.83 (15) ].…”