Diverse Confirmations in the Crystal Structures of 2,3-Dihydro-2,2-dimethylquinazolin-4(1H)-one Derivatives
作者:Jie Sheng、Mei-Mei Zhang、Lian Lu、Xiang-Shan Wang
DOI:10.1007/s10870-012-0303-z
日期:2012.7
The 3-(propan-2-ylideneamino)-2,3-dihydro-2,2-dimethylquinazolin-4(1H)-one and 3-(3-nitrobenzylideneamino)-2,3-dihydro-2,2-dimethylquinazolin-4(1H)-one were synthesized and characterized by IR, 1H NMR and HRMS. The molecular structures were further confirmed by X-ray diffraction analysis. The former 1, C13H17N3O, is monoclinic, space group P2(1)/c, a = 9.056(2), b = 9.439(2), c = 14.872(3) Å, β = 133.121(12)°, Z = 4, V = 1270.9(5) Å3. The latter 2, C17H16N4O3, is also monoclinic, space group P2(1)/c, a = 10.0006(2), b = 12.2298(3), c = 13.3255(3) Å, β = 96.602(2)°, Z = 4, V = 1618.97(6) Å3. It is very interesting that the pyrimidine ring in the 1 adopts a half-chair confirmation, while adapting a skew-boat one in the structure of 2. The 3-(propan-2-ylideneamino)-2,3-dihydro-2,2-dimethylquinazolin-4(1H)-one and 3-(3-nitrobenzylideneamino)-2,3-dihydro-2,2-dimethylquinazolin-4(1H)-one were synthesized and characterized by IR, 1H NMR and HRMS. The molecular structures were further confirmed by X-ray diffraction analysis. The former 1, C13H17N3O, is monoclinic, space group P2(1)/c, a = 9.056(2), b = 9.439(2), c = 14.872 (3) Å, β = 133.121(12)°, Z = 4, V = 1270.9 (5) Å3. The latter 2, C17H16N4O3, is also monoclinic, space group P2(1)/c, a = 10.0006(2), b = 12.2298(3), c = 13.3255(3) Å, β = 96.602(2)°, Z = 4, V = 1618.97(6) Å3. It is very interesting that the pyrimidine ring in the 1 adopts a half-chair confirmation, while adapting a skew-boat one in the structure of 2.
合成了 3-(丙-2-亚基氨基)-2,3-二氢-2,2-二甲基喹唑啉-4(1H)-酮和 3-(3-硝基亚苄基氨基)-2,3-二氢-2,2-二甲基喹唑啉-4(1H)-酮,并通过红外光谱、1H NMR 和 HRMS 进行了表征。分子结构通过 X 射线衍射分析得到进一步证实。前者 1(C13H17N3O)为单斜晶系,空间群为 P2(1)/c,a = 9.056(2), b = 9.439(2), c = 14.872(3) Å, β = 133.121(12)°, Z = 4, V = 1270.9(5) Å3。后一种 2,C17H16N4O3,也是单斜晶体,空间群 P2(1)/c,a = 10.0006(2),b = 12.2298(3), c = 13.3255(3) Å, β = 96.602(2)°, Z = 4, V = 1618.97(6) Å3.非常有趣的是,1 中的嘧啶环采用了半椅确认,而在 2 的结构中则采用了斜船确认。合成了 3-(丙-2-亚氨基)-2,3-二氢-2,2-二甲基喹唑啉-4(1H)-酮和 3-(3-硝基亚苄基氨基)-2,3-二氢-2,2-二甲基喹唑啉-4(1H)-酮,并通过红外光谱、1H NMR 和 HRMS 对其进行了表征。分子结构通过 X 射线衍射分析得到进一步证实。前者 1(C13H17N3O)为单斜晶系,空间群为 P2(1)/c,a = 9.056(2), b = 9.439(2), c = 14.872 (3) Å, β = 133.121(12)°, Z = 4, V = 1270.9 (5) Å3.后一种 2,C17H16N4O3,也是单斜晶体,空间群 P2(1)/c,a = 10.0006(2),b = 12.2298(3), c = 13.3255(3) Å, β = 96.602(2)°, Z = 4, V = 1618.97(6) Å3.非常有趣的是,1 中的嘧啶环采用半椅确认,而 2 的结构则采用斜舟确认。