Cationic Rhodium(I)/H<sub>8</sub>-binap Complex Catalyzed [2+2+2] Cycloadditions of 1,6- and 1,7-Diynes with Carbonyl Compounds
作者:Yousuke Otake、Rie Tanaka、Ken Tanaka
DOI:10.1002/ejoc.200900185
日期:2009.6
catalyzes [2+2+2] cycloadditions of a variety of 1,6- and 1,7-diynes with both electron-deficient and electron-rich carbonyl compounds, leading to dienones in high yield under mild reaction conditions. In the reactions with acyl phosphonates, the reactivity of 1,6- and 1,7-diynes was highly dependent on their own structures. The addition of chelating diethyl oxalate effectively promoted the [2+2+2] cycloadditions
我们已经确定阳离子铑 (I)/H8-binap 络合物可催化各种 1,6- 和 1,7-二炔与缺电子和富电子羰基化合物的 [2+2+2] 环加成,导致在温和的反应条件下高产率的二烯酮。在与酰基膦酸酯的反应中,1,6- 和 1,7- 二炔的反应性高度依赖于它们自身的结构。螯合草酸二乙酯的添加有效地促进了涉及酰基膦酸酯的 [2+2+2] 环加成,这可能是由于二炔和酰基膦酸酯之间通过简单的配体交换平衡形成了所需的二炔和酰基膦酸酯的 1:1 铑配合物。弱配位的草酸二乙酯。在涉及双功能羰基化合物或不对称 1,6-二炔的反应中,观察到高化学或区域选择性。