Synthesis, Tautomeric States and Crystal Structure of (Z)-Ethyl 2-Cyano-2-(3H-Quinazoline-4-ylidene) Acetate and (Z)-Ethyl 2-Cyano-2-(2-Methyl-3H-Quinazoline-4-ylidene) Acetate
作者:M. Tulyasheva、B. Rasulev、A. Tojiboev、K. Turgunov、B. Tashkhodjaev、N. Abdullaev、K Shakhidoyatov
DOI:10.3390/10091209
日期:——
The new compounds (Z)-ethyl 2-cyano-2-(3H- and 2-methyl-3H-quinazoline-4-ylidene) acetate (1 and 2, respectively) were synthesized by multi-step reactions. Thestructures in a solution have been determined by 1H-NMR spectroscopy and in the crystalform by X-ray analysis. Molecule 1 crystallized in a primitive monoclinic cell, spacegroup Р21/c. The cell dimensions are a=7.970(6) å, b=7.061(2) å, c=20.537(7) å,β=97.69(5)°, V=1145.3(10) å3. Molecule 2 crystallized in a triclinic cell, space group P-1, the cell dimensions are a=8.196(5) å, b=8.997(6) å, c=9.435(4) å, α=74.22(4)°,β=89.75(4)°, γ=74.07(5)°, V=641.9(6) å3. In both compounds the presence of intra-molecular NH---O=C hydrogen bonding between the nitrogen atom in position 3 of thequinazoline ring and a carbonyl group of the ethyl cyanoacetate residue was proven byquantum-chemical, 1H-NMR and X-ray methods.
通过多步反应合成了新化合物(Z)-2-氰基-2-(3H- 和 2-甲基-3H-喹唑啉-4-亚基)乙酸乙酯(分别为 1 和 2)。它们在溶液中的结构是通过 1H-NMR 光谱测定的,在晶体中的结构是通过 X 射线分析测定的。分子 1 在原始单斜晶胞中结晶,空间群为 Р21/c。晶胞尺寸为 a=7.970(6) °,b=7.061(2) °,c=20.537(7) °,β=97.69(5) °,V=1145.3(10) °。分子 2 结晶于三linic 晶胞,空间群为 P-1,晶胞尺寸为 a=8.196(5) °,b=8.997(6) °,c=9.435(4) °,α=74.22(4) °,β=89.75(4) °,γ=74.07(5) °,V=641.9(6) °。量子化学、1H-NMR 和 X 射线方法证明了这两种化合物中喹唑啉环第 3 位的氮原子与氰乙酸乙酯残基的羰基之间存在分子内 NH--O=C氢键。