2-Bromo­ethyl 2-chloro-6-methyl­quinoline-3-carboxyl­ate

In the title compound, C13H11BrClNO2, the two rings of the quinoline group are fused in an axial fashion at a dihedral angle of 1.28 (9)°. In the crystal, molecules are arranged in zigzag layers along the c axis. The crystal packing is stabilized by weak C—H⋯O hydrogen bonds and inter­molecular inter­actions between Br and O atoms [Br⋯O= 3.076 (2) Å], resulting in the formation of a three-dimensional network

2-(2-Chloro-6,7-dimethyl­quinolin-3-yl)-2,3-dihydro­quinolin-4(1H)-one

In the title mol­ecule, C20H17ClN2O, the dihedral angle between the mean plane of the quinoline ring system and the benzene ring of the dihydro­quinolinone moiety is 57.84 (8)°. In the crystal, mol­ecules are linked into centrosymmetric dimers via pairs of inter­molecular N—H⋯N hydrogen bonds. These dimers are further stabilized by weak π–π stacking inter­actions between pyridine rings with a centroid–centroid distance of 3.9414 (12) Å

Ethyl 4-(2-chloro­quinolin-3-yl)-1-phenyl-1H-pyrrole-3-carboxyl­ate

In the mol­ecule of the title compound, C22H17ClN2O2, the dihedral angles formed by the pyrrole ring with the quinoline and phenyl rings are 67.93 (8) and 28.40 (11)°, respectively. In the crystal structure, mol­ecules are linked into dimers by inter­molecular C—H⋯O hydrogen bonds

2-Chloro-3-[(E)-(hydrazin-1-yl­idene)meth­yl]-6-meth­oxy­quinoline

In the title compound, C11H10ClN3O, the quinoline ring system is essentially planar, the r.m.s. deviation for the non-H atoms being 0.014 (2) Å with a maximum deviation from the mean plane of 0.0206 (14) Å for the C atom bonded to the –CH—N=NH2 group. In the crystal, molecules are linked via N—H⋯O and N—H⋯N hydrogen bonds, forming zigzag layers parallel to (010)

5,8-Dimeth­oxy-2-phenyl-1,4-dihydro­quinoline-3-carbonitrile

The crystal structure of the title mol­ecule, C18H16N2O2, can be described as two types of crossed layers parallel to the (110) and (10) planes. An intra­molecular N—H⋯O hydrogen bond occurs

Ethyl 3-(2-chloro-5,8-dimeth­oxy­quinolin-3-yl)-2-cyano­oxirane-2-carboxyl­ate

The title mol­ecule, C17H15ClN2O5, contains a quinolyl unit linked to a functionalized oxirane system with a 2,3-trans arrangement of the substituents (ester group versus quinol­yl). The structure can be described as being built up from zigzag layers parallel to (10). The heterocyclic ring of the quinolyl unit forms a dihedral angle of 60.05 (1)° with the oxirane plane. The crystal packing is stabilized by inter­molecular C—H⋯O and C—H⋯N hydrogen bonding, resulting in the formation of an infinite three-dimensional network and reinforcing the cohesion between the layers