An asymmetric hydrophosphination of 3,3-disubstituted cyclopropenes catalyzed by Cu(I)-(R,R)-QUINOXP* is developed, affording a series of phosphine derivatives in high to excellent diastereo- and enantioselectivities.
开发了 Cu(I)-( R , R )-QUINOXP*催化的 3,3-二取代环丙烯的不对称氢膦化反应,提供了一系列具有高至优异的非对映选择性和对映选择性的膦衍生物。
Nickel-Catalyzed Enantioselective Hydrothiocarbonylation of Cyclopropenes
in the literature. Herein, we report a nickel-catalyzed enantioselective hydrothiocarbonylation of cyclopropenes for the synthesis of a diverse collection of functionalized thioesters in good to excellent yields with high stereoselectivity. This new method employs an inexpensive, air-stable nickel(II) precursor, which provides enhanced catalyst fidelity against CO poisoning compared to nickel(0) catalysts
使用一氧化碳和硫醇对烯烃进行氢硫羰基化是从简单结构单元合成硫酯的有效方法。由于催化剂中毒的固有挑战,过渡金属催化的不对称硫代羰基化,特别是在利用地球丰富的金属时,在文献中仍然很少见。在此,我们报道了镍催化的环丙烯对映选择性硫代羰基化反应,用于合成多种官能化硫酯,收率良好至优异,具有高立体选择性。这种新方法采用廉价、空气稳定的镍 (II) 前驱体,与镍 (0) 催化剂相比,它可以提高催化剂保真度,防止 CO 中毒。
Copper-catalyzed conjugate addition of allene-derived nucleophiles to alkenyl-substituted carboxamides
Catalytic Michael additionreaction represents a fundamental importance in organic synthetic chemistry. Whereas corresponding conversions toward intrinsically low reactive enamide remains an ongoing challenging. We herein report a copper-catalyzed conjugate addition of allenes to β-substituted alkenyl amides, one of the most challenging Michael acceptors. The present method utilizes readily available
Enantioselective Desymmetrization of Cyclopropenes by Hydroacylation
作者:Diem H. T. Phan、Kevin G. M. Kou、Vy M. Dong
DOI:10.1021/ja107738a
日期:2010.11.24
We report an enantioselective desymmetrization of cyclopropenes by intermolecular Rh-catalyzed hydroacylation. Cyclopropylketones, bearing quaternary stereocenters, are produced with diastereocontrol (up to >20:1) and excellent enantiomeric excess (up to >99 ee).