Synthesis, X-Ray Crystal Structure and Spectroscopic Properties of 1,2,3,4-Tetrahydro-2-(thenyl)-3-(N-thenylidine)-4-oxoquinazoline
作者:Sumita Naskar、Subhendu Naskar、Alexander J. Blake、Haregewine Tadesse、Shyamal Kumar Chattopadhyay
DOI:10.1007/s10870-011-0030-x
日期:2011.7
The Schiff base formed between anthraniloyl hydrazide and thiophen-2-aldehyde is synthesized. Reaction of this Schiff base with VOSO4 in methanol at room temperature does not yield the expected vanadium complex; instead, the Schiff base is transformed to 1,2,3,4-tetrahydro-2-(thenyl)-3-(N-thenylidine)-4-oxoquinazoline, which has been characterized by elemental analyses and by LC–MS, i.r., n.m.r. and electronic spectroscopies. The X-ray crystal structure of the quinazoline product is reported. The compound crystallizes with monoclinic (P21/n) space group, and the cell parameters are: a = 5.9442(7) Å, b = 13.6357(15) Å, c = 19.455(2) Å, β = 90.499(2)°. The oxo-quinazoline product is found to be luminescent when excited at its lowest energy transition. Reaction of anthraniloyl hydrazone of thiophen-2-aldehyde with VOSO4 in methanol leads to formation of 1,2,3,4-tetrahydro-2-(thenyl)-3-(N-thenylidine)-4-oxoquinazoline, which has been characterized by X-ray crystal structure determination and different spectroscopic techniques.
合成了蚁酰肼和噻吩-2-甲醛之间形成的希夫碱。室温下该希夫碱与 VOSO4 在甲醇中的反应并没有产生预期的钒络合物;相反,该希夫碱转化成了 1,2,3,4-四氢-2-(henyl)-3-(N-thenylidine)-4-氧代喹唑啉,并通过元素分析、LC-MS、i.r.、n.m.r.和电子光谱对其进行了表征。报告了喹唑啉产物的 X 射线晶体结构。该化合物结晶为单斜(P21/n)空间群,晶胞参数为:a = 5.9442(7) 埃,b = 13.6357(15) 埃,c = 19.455(2) 埃,β = 90.499(2)°。发现氧代喹唑啉产物在其最低能量转变激发时会发光。噻吩-2-甲醛的蒽酰腙与 VOSO4 在甲醇中反应生成 1,2,3,4-四氢-2-(苯乙基)-3-(N-苯胺)-4-氧代喹唑啉,并通过 X 射线晶体结构测定和不同的光谱技术对其进行了表征。