Synthesis, crystal structure and Hirshfeld surface analysis of 3-(4,4-dimethyl-2,3,4,5-tetrahydro-1 H -1,5-benzodiazepin-2-ylidene)-6-methyl-3,4-dihydro-2 H -pyran-2,4-dione

The title compound, C 17 H 18 N 2 O 3, is constructed from a benzodiazepine ring system linked to a pendant dihydropyran ring, where the benzene and pendant dihydropyran rings are oriented at a dihedral angle of 15.14 (4)°. Intramolecular N - H Diazp ⋯O Dhydp and C - H Diazp ⋯O Dhydp (Diazp = diazepine and Dhydp = dihydropyran) hydrogen bonds link the seven-membered diazepine ring to the pendant dihydropyran ring, enclosing S(6) ring motifs. In the crystal, N - H Diazp ⋯O Dhydp hydrogen bonds link the molecules into infinite chains along [10 ]. These chains are further linked via C - H Bnz ⋯O Dhydp, C - H Dhydp ⋯O Dhydp and C - H Mth ⋯O Dhydp (Bnz = benzene and Mth = methyl) hydrogen bonds, forming a three-dimensional network. The observed weak C - H Diazp ⋯ π interaction may further stabilize the structure. Hirshfeld surface analysis of the crystal structure indicates that the most important contributions for the crystal packing are from H⋯H (51.1%), H⋯C/C⋯H (25.3%) and H⋯O/O⋯H (20.3%) interactions. Hydrogen bonding and van der Waals interactions are the dominant interactions in the crystal packing.