作者:A. Kakehi、K. Kitajima、S. Ito、N. Takusagawa
DOI:10.1107/s0108270194012977
日期:1995.5.15
The pyrazole and pyridine rings in the pyrazolo[1,5-a]pyridine skeleton of 1-ethyl-2-oxo-1,2-dihydrodipyrido[1, 2-b:3',2'-d]pyrazole-3-carbonitrile, C13H10N4O, are planar [maximum deviations 0.004(3) and 0.004(3) Angstrom respectively], and are almost coplanar to each other with a dihedral angle of 0.9 (3)degrees. The planar 2-pyridone ring (fused to the pyrazolo[l,5-a]pyridine ring at the 2- and 3-positions) is also nearly coplanar with the pyrazolo[1,5-a]pyridine ring [maximum deviation 0.032(3)Angstrom, dihedral angle 0.9 (3)degrees]. The delocalized ring system extends to the fused 2-pyridone ring.