Chiral-Zn(NTf<sub>2</sub>)<sub>2</sub>-Complex-Catalyzed Diastereo- and Enantioselective Direct Conjugate Addition of Arylacetonitriles to Alkylidene Malonates
Chiral N,N′‐dioxide/Zn(NTf2)2 complexes were demonstrated to be highly effective in the direct asymmetricconjugateaddition of arylacetonitriles to alkylidene malonates under mild conditions. A wide range of substrates were tolerated to afford their corresponding products in moderate‐to‐good yields with high diastereoselectivities (82:18–>99:1 d.r.) and enantioselectivities (81–99 % ee). The reactions
[EN] ARYL SUBSTITUTED BICYCLIC COMPOUNDS AS HERBICIDES<br/>[FR] COMPOSÉS BICYCLIQUES SUBSTITUÉS PAR UN ARYLE À TITRE D'HERBICIDES
申请人:DU PONT
公开号:WO2016182780A1
公开(公告)日:2016-11-17
Disclosed are compounds of Formula 1, including all N oxides, stereoisomers, and salts thereof, wherein Q1, Q2, R1, R2, Y, J and R7 are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound or a composition of the invention.
efficient catalytic asymmetric Friedel–Crafts alkylation of indoles with alkylidene malonates has been developed by using a chiral N,N′‐dioxide–Sc(OTf)3 complex as the catalyst (see scheme). Some opticallyactive intermediates containing the indole skeleton have been synthesized, such as indolepropionic acid, tryptamines, and β‐carbolines. The coordination between the scandium atom and the chiral N,N′‐dioxide
Here, we report a convenient access to diastereoselectivesynthesis of polysubstituted pyrrolidines bearing a unique spiro quaternary center at the C-2 position and another quaternary center at C-4. The synthesis system, CuII/P, N-Ligand-catalyzed 1, 3-dipolar cycloaddition, by employing homoserine lactone derived cyclic imino esters as the dipoles and α, α, β-trisubstituted olefins as the dipolarophlies
在这里,我们报告了一个方便的方法,可方便地进行多取代的吡咯烷的非对映选择性合成,该取代基在C-2位置带有一个独特的螺旋季中心,在C-4位置具有另一个季中心。通过使用高丝氨酸内酯衍生的环状亚氨基酯作为偶极,以α,α,β-三取代烯烃为偶极子,Cu II / P,N-配体催化的1,3-偶极环加成反应的合成系统提供了exo -spiro-吡咯烷类具有良好的收率,高的非对映选择性(高达> 98:2 dr),并且在广泛的底物上表现良好。