title: Crystal structure of 2-acetyl-5-(3-methoxyphenyl)-3,7-dimethyl-5H-1,3-thiazolo[3,2-a]pyrimidine-6-carboxylate.
abstract: In the title mol-ecule, C20H22N2O4S, the pyrimidine ring is in a flattened half-chair conformation and the 3-meth-oxyphenyl substituent is in an axial arrangement. The thia-zole ring forms a dihedral angle of 81.3 (1)° with the benzene ring. In the crystal, weak C-H⋯S inter-actions link mol-ecules into chains along [001]. In addition, there are π-π inter-actions between inversion-related thia-zole rings with a centroid-centroid distance of 3.529 (2) Å. The ethyl group was refined as disordered over two sets of sites with an occupancy ratio of 0.52 (3):0.48 (2).
authors.affiliation: Department of Studies in Chemistry, Bangalore University, Bangalore 560 001, Karnataka, India.
authors.forename: N L
authors.initials: NL
authors.lastname: Prasad
authors.affiliation: Department of Studies in Chemistry, Bangalore University, Bangalore 560 001, Karnataka, India.
authors.forename: M S
authors.initials: MS
authors.lastname: Krishnamurthy
authors.affiliation: Department of Studies in Chemistry, Bangalore University, Bangalore 560 001, Karnataka, India.
authors.forename: H
authors.initials: H
authors.lastname: Nagarajaiah
authors.affiliation: Department of Studies in Chemistry, Bangalore University, Bangalore 560 001, Karnataka, India.
authors.forename: Noor Shahina
authors.initials: NS
authors.lastname: Begum
keywords: C—H⋯S inter­actions; crystal structure; thia­zolo­pyrimidine derivative; π–π inter­actions