title: 3-Acetyl-2-methyl-4-(pyridin-3-yl)-1,4-di-hydro-indeno-[1,2-b]pyridin-5-one.
abstract: In the title compound, C20H16N2O2, the condensed tricyclic fragment is near to planar, with an r.m.s. deviation of 0.0531 Å. The 1,4-di-hydro-pyridine (1,4-DHP) ring adopts a slightly puckered boat-like conformation. The N and opposite C atoms deviate from the least-squares plane of the four other ring atoms by 0.039 (3) and 0.141 (3) Å, respectively. The C=O group located at the tricyclic fragment is fixed in an s-trans orientation, while the second C=O group adopts an s-cis orientation with respect to the double bonds of the 1,4-DHP ring. The pyridine ring has a pseudo-axial orientation with respect to the 1,4-DHP ring. The dihedral angle between the tricyclic system and the pyridine ring is 77.3 (3)°. In the crystal, the pyridine N atom accepts a hydrogen bond from the N-H group of the 1,4-DHP ring. The hydrogen bonds link the mol-ecules into infinite C(8) chains along the b-axis direction.
authors.affiliation: Latvian Institute of Organic Synthesis, 21 Aizkraukles street, Riga LV-1006, Latvia.
authors.forename: Imants
authors.initials: I
authors.lastname: Bisenieks
authors.forename: Anatoly
authors.initials: A
authors.lastname: Mishnev
authors.forename: Imanta
authors.initials: I
authors.lastname: Bruvere
authors.forename: Brigita
authors.initials: B
authors.lastname: Vigante
authors.forename: Zigmars
authors.initials: Z
authors.lastname: Andzans