Highly Diastereoselective Synthesis of Polysubstituted Cyclopropanecarbonitriles via Palladium-Catalyzed Cyanoesterification of Cyclopropenes
作者:Can Li、Rongrong Yu、Song-Zhou Cai、Xianjie Fang
DOI:10.1021/acs.orglett.3c01875
日期:2023.7.14
We herein develop a highlydiastereoselectivesynthesis of cyano-substituted cyclopropanes via palladium-catalyzed direct cyanoesterification of cyclopropenes, which features mild reaction conditions, good functional group compatibility, and simple operation. This transformation represents a stepwise, highly atom economic, and scalable protocol for obtaining synthetically useful cyclopropanecarbonitriles
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。
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
A convenient preparative protocol for the synthesis of various 3-arylcyclopropenes in a multigram, scale is disclosed. Optimization of the reaction conditions and isolation procedures allowed for significant improvement of the chemical yields of these strained products. The described protocol was used for efficient preparation of a series of 3-methyl-3-arylcyclopropenes possessing different substituents in the aromatic ring. The effect of substitution in the aryl group on the stability of 3-arylcyclopropenes, as well as the corresponding precursors, is discussed. (c) 2008 Elsevier Ltd. All rights reserved.