芳族醛与酮的交联醇醛缩合反应,如:丙酮和环己酮可有效地形成交叉共轭的α,β-不饱和酮,且产率极高。丙酮和环己酮衍生的α,β-不饱和酮与(硫代)巴比妥酸的分子内和分子内迈克尔加成反应导致合成新型的7,11-二芳基-2,4-二氮杂螺[5.5]十一烷-1, 3,5,9-丁酮和2,4-二芳基-1'H-螺[双环[3.3.1]壬烷-3,5'-嘧啶] -2',4',6',9(3'H )-四酮,分别具有良好的收率。通过1 H NMR,13 C NMR,FT-IR,UV-Visible,质谱和X射线晶体学技术进行结构阐明。讨论了一种可能的形成机理。结构构象还由邻近质子和双子质子之间的二面角衍生的耦合常数证明。来自巴比妥酸的螺环化合物的NH质子的1 H NMR光谱显示宽的单峰,而源自硫代巴比妥酸的螺环化合物中的这些质子显示两个不同的峰。关键词:交叉羟醛缩合,迈克尔加成,[1 + 5]环加成,巴比妥酸,构象,螺环巴比妥酸盐。化学
Studies on Spiroheterocycles, Part II: Heterocyclization of the Spiro Compounds Containing Cyclohexanone and Thiobarbituric Acid with Different Bidentate Nucleophilic Reagents
作者:Rajani Kanta Behera、Ajay Kumar Behera、Rosy Pradhan、Anita Pati、Manabendra Patra
DOI:10.1080/00397910600946231
日期:2006.12
thiobarbituric acid with different diarylidene ketones 1a–c yields the spiro compounds 2a–c. The diarylidene derivatives 3a–c are synthesized by the condensation of spiro compounds 2a–c with different aldehydes. A series of spiro heterocycles compounds 4a–l, 5a–l, 6a–l, 7a–l, 8a–l, and 9a–l are synthesized from the diarylidene compounds. The structures of the compounds are ascertained from their analytical