烯烃是用于有机转化的理想且用途广泛的起始材料,也是众所周知的钯催化底物。通常,这些反应会通过β-氢化物消除形成新的烯烃产物。与这种情况相比,我们的实验室参与了烯烃加氢和双官能化反应的开发,其中可以控制 β-氢化物的消除。我们在此报告了不对称钯催化加氢芳基化的发展,该反应可产生高达 75% ee 的二芳基次甲基产物。有趣的是,在一定范围内的配体空间体积与反应的 ee 之间观察到线性自由能关系。
One-Pot Catalytic Asymmetric Synthesis of Tetrahydrocarbazoles
作者:Qiong-Jie Liu、Wen-Guang Yan、Lijia Wang、X. Peter Zhang、Yong Tang
DOI:10.1021/acs.orglett.5b01909
日期:2015.8.21
A one-pot asymmetric synthesis of 1,2,3,4-tetrahydrocarbizoles has been developed via an enantioselective [3 + 3] annulation of 2-alkynylindoles and donor acceptor cyclopropanes. In the presence of chiral Lewis acids as catalysts, a series of optically active tetrahydrocarbazoles were furnished in high yields (63-87%) With good to excellent levels of enantioselectivity (up to 94% ee).