title: Crystal structure of 4-(4b,8a-di-hydro-9H-pyrido[3,4-b]indol-1-yl)-7-methyl-2H-chromen-2-one.
abstract: The title compound, C21H14N2O2, was prepared by Pictet-Spengler cyclization of tryptamine and 4-formyl coumarin. In the mol-ecule, the dihedral angle between the mean planes of the coumarin and β-carboline ring systems is 63.8 (2)°. In the crystal, mol-ecules are linkedviaN-H⋯N hydrogen bonds, forming chains along theb-axis direction. Within the chains, there are a number of offset π-π inter-actions present [shortest inter-centroid distance = 3.457 (2) Å].
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, India.
authors.forename: S
authors.initials: S
authors.lastname: Samundeeswari
authors.affiliation: Department of Chemistry, Karnatak University, Dharwad, India.
authors.forename: Manohar V
authors.initials: MV
authors.lastname: Kulkarni
authors.affiliation: Department of Physics, M. S. Ramaiah Institute of Technology, Bangalore, India.
authors.forename: G N
authors.initials: GN
authors.lastname: Anil Kumar
keywords: coumarins; crystal structure; hydrogen bonding; norharman; β-carboline; π-π inter­actions