Catalytic enantioselective synthesis of sterically demanding alcohols using di(2°-alkyl)zinc prepared by the refined Charette's method
作者:Manabu Hatano、Tomokazu Mizuno、Kazuaki Ishihara
DOI:10.1039/c0cc01301c
日期:——
A highly practical, catalytic enantioselective 2°-alkyl addition to aldehydes and ketones was developed. Chiral phosphoramide ligand (1) with salt-free and solvent-free di(2°-alkyl)zinc reagents prepared from (2°-alkyl)MgCl was essential.
Bifunctional phase-transfer catalysts for fixation of CO<sub>2</sub> with epoxides under ambient pressure
作者:Yue-Dan Li、Dong-Xiao Cui、Jun-Chao Zhu、Ping Huang、Zhuang Tian、Yan-Yan Jia、Ping-An Wang
DOI:10.1039/c9gc02058f
日期:——
A series of bifunctional phase-transfercatalysts with a quaternary onium center and a hydrogen-bonding donor group were prepared for the fixation of CO2 with commercially available epoxides under mild conditions by using a CO2 balloon (1 atm). In the presence of 2.5 mol% of achiral bifunctional phase-transfercatalysts, cyclic carbonates were obtained in good to excellent yields (up to 95%). Additionally
A highly efficient enantioselective organozinc (R2Zn) addition to ketones catalyzed by chiral phosphoramide-Zn(II) complexes (1-10 mol %) has been developed. These complexes serve as conjugate Lewis acid-Lewis base catalysts. Chiral phosphoramides are derived from an inexpensive natural amino acid (i.e., L-valine). From a variety of nonactivated aromatic and aliphatic ketones, the corresponding optically
7-azaindol-3-ylacrylamides active as kinase inhibitors
申请人:NERVIANO MEDICAL SCIENCES S.r.l.
公开号:EP2070928A1
公开(公告)日:2009-06-17
Compounds represented by Formula (I)
wherein R1 and R2 are as defined in the specification, compositions thereof, and methods of use thereof.
由式(I)表示的化合物,其中R1和R2如规范中定义,以及它们的组合物和使用方法。
Enantioselective amination of nitroolefins under base-free and water-rich conditions using chiral bifunctional phase-transfer catalysts
作者:Junchao Zhu、Dongxiao Cui、Yuedan Li、Jingxu He、Weiping Chen、Pingan Wang
DOI:10.1039/c8ob00583d
日期:——
The direct enantioselective amination of nitroolefins has been performed with L-tert-leucine-derived squaramide-scaffold bifunctional phase-transfer catalysts under base-free and water-rich conditions with low catalyst loading (0.5–1 mol%) to provide 2-aminonitroalkanes in good yields (up to 96%) and enantioselectivities (up to 93% ee).