AlCl<sub>3</sub>-Promoted Highly Regio- and Diastereoselective [3 + 2] Cycloadditions of Activated Cyclopropanes and Aromatic Aldehydes: Construction of 2,5-Diaryl-3,3,4-trisubstituted Tetrahydrofurans
作者:Gaosheng Yang、Yue Shen、Kui Li、Yongxian Sun、Yuanyuan Hua
DOI:10.1021/jo1020773
日期:2011.1.7
The AlCl3-catalyzed [3 + 2] cycloaddition reaction of diethyl trans-2,3-disubstituted cyclopropane-1,1-dicarboxylates and aromatic aldehydes was carried out under mild conditions to provide a series of diethyl 2,5-diaryl-4-benzoyltetrahydrofuran-3,3-dicarboxylates in moderate to good yields with excellent diastereoselectivities. While common 2,5-cis products were obtained with electron-neutral or electron-poor
在温和的条件下进行AlCl 3催化的二乙基反式-2,3-二取代的环丙烷-1,1-二羧酸酯与芳族醛的[3 + 2]环加成反应,得到一系列的二乙基2,5-二芳基-4 -苯甲酰基四氢呋喃-3,3-二羧酸酯具有中等至良好的收率,具有出色的非对映选择性。当使用电子中性或贫电子的芳基醛获得常见的2,5-顺式产物时,当使用富含电子的芳基醛时,则以极好的非对映选择性获得了较不常见的2,5-反式产物。这些典型产品的相对构型已通过X射线晶体学分析得到了证实。