Synthesis and Crystal Structures of 2-Amino-4-methyl-5,6,7,8-tetrahydroquinoline-3-carbonitrile and 2-Amino-4-phenyl-4a,5,6,7-tetrahydro-4H-naphthalene-1,3,3-tricarbonitrile
作者:Aisha Saddiqa、Iftikhar Hussain Bukhari、Muhammad Nawaz Tahir、Matloob Ahmad、Muhammad Shafiq、Muhammad Nadeem Arshad
DOI:10.14233/ajchem.2015.17789
日期:——
2-Amino-4-methyl-5,6,7,8-tetrahydroquinoline-3-carbonitrile with m.f. C11H13N3 was synthesized using simple multicomponent reaction of cyclohexanone, malononitrile and acetaldehyde. However, in an effort to synthesize another analogue of I using benzaldehyde in placement of acetaldehyde, 2-amino-4-phenyl-4a,5,6,7-tetrahydro-4H-naphthalene-1,3,3-tricarbonitrile (II) [C19H16N4] was formed. The compounds I and II were crystallized in triclinic and orthorhombic crystal system with space group P-1 and Pbca. The two carbon atoms in tetrahydroquinoline-3-carbonitrile were disordered over two positions which were refined using EADP constraint. The dihedral angle puckering parameters of different planes were measured. It is found that both of these molecules are involved in classical N-H…N type hydrogen bonding interaction which forms dimers through the formation of different ring motifs i.e. R22 (8) and R22 (12). In quinoline-3-carbonitrile N-H…N interactions forms sheets along ab plane while in naphthalene-1,3,3-tricarbonitrile infinite two dimensional network stabilize the crystal structure along (0 0 1) plane.
2-氨基-4-甲基-5,6,7,8-四氢喹啉-3-甲腈(分子式为C11H13N3)是通过环己酮、丙二腈和乙醛的简单多组分反应合成的。然而,为了用苯甲醛代替乙醛合成I的另一种类似物,形成了2-氨基-4-苯基-4a,5,6,7-四氢-4H-萘-1,3,3-三甲腈(II)[C19H16N4]。化合物I和II在三方晶系和正交晶系中结晶,空间群为P-1和Pbca。四氢喹啉-3-甲腈中的两个碳原子在两个位置上无序,使用EADP约束进行了优化。测量了不同平面的二面角褶皱参数。发现这两种分子都参与了经典的N-H…N型氢键相互作用,通过形成不同的环状图案(即R22(8)和R22(12))形成二聚体。在喹啉-3-甲腈中,N-H…N相互作用沿ab平面形成片层,而在萘-1,3,3-三甲腈中,无限的二维