The title compounds have been synthesized via a three-component reaction and their structures were characterized by IR,1H NMR,13C NMR and X-ray single-crystal diffraction. The crystal of compound 4a belongs to monoclinic,space group P121/c1 with a = 8.575(3),b = 9.590(3),c = 21.431(6) ,β = 91.172(3)°,V = 1762.1(9) 3,Mr = 393.36,Z = 4,Dc = 1.483 g/cm3,μ(MoKα) = 0.113 mm-1,F(000) = 816,the final R = 0.0366 and wR = 0.0941. The crystal of compound 4b is of triclinic,space group P-1 with a = 8.6420(17),b = 9.761(2),c = 11.132(2),α = 97.51(3),β = 97.86(3),γ = 92.85(3)°,V = 920.1(3) 3,Mr = 393.36,Z = 2,Dc = 1.420 g/cm3,μ(MoKα) = 0.108 mm-1,F(000) = 408,the final R = 0.0612 and wR = 0.1781. In each molecular structure,the naphthalene rings and pyran rings are almost coplanar with the latter in an envelope conformation. The rings formed by the N-H···O intramolecular hydrogen bonds are almost planar in these compounds. Their crystal packing is stabilized by intermolecular hydrogen bonds together with C-H···π and π-π stacking interactions.
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