The title compound 9-（2-hydroxy-5-nitrophenyl）-9H-dibenzo[c,h]-2,7,10-trioxan-thene-1,8-dione DMF solvate （C28H20N2O9,Mr=528.46） was synthesized and crystallized.The crystal belongs to the triclinic system,space group P1 with a=10.210（3）,b=10.698（4）,c=12.522（4）,α=92.214（6）,β=113.751（5）,γ=105.040（5）°,Z=2,V=1193.0（7）3,Dc=1.471 g·cm-3,μ（MoKα）=0.112 mm-1,F（000）=548,R=0.0444 and wR=0.1141 for 2667 observed reflections （I 〉 2σ（I））.X-ray analysis reveals that atoms C（1）,C（2）,C（3）,C（4）,C（5） and O（1） on the new 4H-pyran ring are slightly distorted,forming a half-chair conformation.
The title compound 8-（2,3-dimethoxyphenyl）-10,11,12,13-tetrahydro-9H-benzo[f]- cyclohepta[c]quinoline （C26H25NO2, Mr = 383.47） was synthesized and characterized by IR, 1H NMR, 13C NMR and elemental analysis. The crystal belongs to triclinic, space group PI with a = 8.1490（16）, b = 9.2550（19）, c = 14.373（3） A, α = 86.96（3）,β= 89.66（3）, γ= 70.32（3）°, Z = 2, V= 1019.2（4） A3, Dc = 1.250 g.cm^-3,μ（MoKα） = 0.078 mm^-1, F（000） = 408, the final R = 0.0555 and wR = 0.1240 for 2228 observed reflections （I 〉 2σ（I））. X-ray analysis reveals that the seven-numbered ring is slightly similar to a six-numbered ring, forming the chairlike conformation. The four rings （Ⅰ, Ⅱ, Ⅲ and Ⅳ） in the benzo[f]cyclohepta[c]quinoline moiety form a screw structure.
The title compound 12-（2,4-dichlorophenyl）-7,8,9,10,11,12-hexahydrobenzo-[f]pyrimido[4,5-b]quinoline-9,11-dione DMF solvate 1（C24H20Cl2N4O3,Mr=483.34） was synthesized and crystallized.The crystal belongs to the monoclinic system,space group P21/n with a=6.4798（16）,b=20.595（5）,c=16.723（4）,β=95.267（7）o,Z=4,V=2222.3（9）3,Dc=1.445 g/cm3,μ（MoKα）=0.328 mm-1,F（000）=1000,the final R=0.0530 and wR=0.1388 for 3484 observed reflections（I2σ（I））.X-ray analysis reveals that the central 1,4-dihydropyridine ring is slightly distorted,adopting a half-chair conformation,which is obviously different from the boat conformations of other similar compounds.In addition,the classical hydrogen bonds of N（2）-H（2A）…O（2） are presented in the crystals,and link the adjacent molecules to form dimmers.Atom O（3） in the DMF solvent forms two hydrogen bonds of O（3）…H（1H）-N（1） and O（3）…H（3H）-N（3） with a pyrimidoquinoline moiety,forming an interesting half-chair-like conformation.The hydrogen bonds link the molecules to form dimmers,while intermolecular π-π interaction connects the above-mentioned dimmers to yield a one-dimensional structure.
The title compound exo-4-（3,4-dichlorophenyl）-8-ethyl-3,3a,4,5,8,12d-hexahydro-2H-furo[3,2-c]indolo[3,2-f]quinoline （C25H22Cl2N2O, Mr = 437.35） was synthesized and crystallized. The crystal belongs to tetragonal, space group I4（1）/a with a = 17.4903（3）, b = 17.4903（3）, c = 28.3403（5） , Z = 16, V = 8669.6（3） 3, Dc = 1.340 g·cm-3, μ（MoKɑ） = 0.319 mm-1, F（000） = 3648, R = 0.0429 and wR = 0.711 for 2714 observed reflections I 2σ（I）. X-ray analysis reveals that atoms C（1）, C（2）, C（3）, C（4）, C（5） and N（1） on the new pyridine ring are slightly distorted, forming a distorted boat conformation.
The title compound 4-（2-bromophenyl）-3,4,7,8-tetrahydro-7,7-dimethyl-1-p-tolylquinoline-2,5（1H,6H）-dione 1 （C24H24BrNO2, Mr = 438.35） was synthesized and characterized by IR, 1H NMR and elemental analysis. The crystal belongs to monoclinic, space group C2/c with a = 27.565（14）, b = 10.079（5）, c = 15.917（8） A,β = 111.059（9）°, Z = 8, V = 4127（4）A3, Dc = 1.411 g·cm^-3,μ（MoKa） = 2.011 mm^-1, F（000） = 1808, the final R = 0.0417 and wR = 0.1032 for 2393 observed reflections （I 〉 2σ（I））. X-ray analysis reveals that the pyridine ring adopts a distorted boat conformation, while another six-membered ring takes a half-chair conformation. In addition, there are non-classical hydrogen bonds of C-H…O and C-H…Br in the structure. The short distance （3.481A） between the adjacent 2-bromophenyl rings indicates the existence of π-π interaction.
