1,3-偶极环加成合成双-1,2,4-噁二唑啉衍生物及单晶结构

2-苯基-1,2,3-三唑基-4-甲醛与1,3-丙二胺或对苯二胺缩合, 形成新的双席夫碱3和4, 然后分别与氯代肟在三乙胺条件下发生1,3-偶极环加成, 得到新型双-1,2,4-噁二唑衍生物6a～6f和7a～7f. 结构经元素分析, IR, 1H NMR和MS确证， 并用X射线衍射法测定了化合物6e的晶体结构. 化合物6e属于单斜晶系, C2/c空间群, 晶胞参数 a＝3.5134(8) nm, b＝0.50575(11) nm, c＝2.0598(5) nm, α＝90°, β＝102.02(8)°, γ＝90°, Mr＝756.81, V＝3.5798(14) nm3, Dc＝1.404 g/cm3, Z＝4, F(000)＝1576, μ＝0.095 mm－1, R＝0.0787, wR＝0.2093.

Synthesis and Crystal Structure of Bis-1,2,4-oxadiazoline Derivatives by 1,3-Dipolar Cycloaddition

Condensation of propane-1,3-diamine or benzene-1,4-diamine with 2-phenyl-1,2,3-triazole-4- carboxaldehyde give a series of new bis-Schiff bases 3 and 4, which were then reacted with α-chloro-oximes to afford a bis-1,2,4-oxadiazoline derivatives 6a～6f and 7a～7f by 1,3-dipolar cycloaddition. The new compounds were characterized by elemental analysis, IR, 1H NMR, MS techniques and X-ray diffraction analysis. The crystal of the compound 6e belongs to monoclinic, space group C2/c with cell parameter a＝3.5134(8) nm, b＝0.50575(11) nm, c＝2.0598(5) nm, α＝90°, β＝102.02(8)°, γ＝90°, Mr＝756.81, V＝3.5798(14) nm3, Dc＝1.404 g/cm3, Z＝4, F(000)＝1576, μ＝0.095 mm－1, R＝0.0787 and wR＝0.2093.