7,9-Dichloro-6H,12H-indolo[2,1-b]quinazoline-6,12-dione

Abstract

There are two independent mol­ecules in the asymmetric unit of the title compound, C15H6Cl2N2O2. The conjugated four-ring system is essentially planar in each mol­ecule [maximum deviation = 0.089 (2) Å]. In the crystal, weak inter­molecular C—H⋯Cl, C—H⋯O and C—H⋯·N inter­actions help to stabilize the packing.

7H-[1,2]Benzothiazolo[3,2-b]quinazoline 5,5-dioxide

“…The phenyl ring (C9-C14) forms the dihedral angles of 5.01 (8)° and 5.41 (7)° with the pyrimidine ring (N1/N2/C7-C10) and the phenyl ring (C1-C6), respectively. The title compound exibits the structural similarities with already reported structures (Khan et al, 2012;Grundt et al, 2010 9Å, respectively, where Cg1 is the centre of gravity of (C1/C6/C7/N1/S1) ring; Cg3 is the centre of gravity of (C1-C6) ring; Cg4 is the centre of gravity of (C9-C14) ring. The symmetry codes:…”

“…For the uses and biological importance of benzothiazole and quinazoline derivatives, see: Schwartz et al (1992); Wolfe et al (1990); Tereshima et al (1995). For related structures, see: Khan et al (2012); Grundt et al (2010). Table 1 Hydrogen-bond geometry (Å , ).…”

rac-(6S)-6-Hydroxy-6-{2-[2-(propan-2-ylidene)hydrazinylidene]propyl}indolo[2,1-b]quinazolin-12(6H)-one

“…For reactions occurring at the 6-keto group of tryptanthrin with nucleophiles including CH-acidic compounds, see: Grandolini et al (1997); Bergman & Tilstam (1985); Jao et al (2008); Zou & Huang (1985). For related strutures, see: Brufani et al (1971); Bergman et al (1987); Jao et al (2008); Grundt et al (2010). For the Chebychev weighting scheme, see: Prince (1982); Watkin (1994).…”