Catalytic enantioselective acyl transfer: the case for 4-PPY with a C-3 carboxamide peptide auxiliary based on synthesis and modelling studies
作者:Rudy E. Cozett、Gerhard A. Venter、Maheswara Rao Gokada、Roger Hunter
DOI:10.1039/c6ob01991a
日期:——
and evaluated in the kinetic resolution of a small library of chiral benzylic secondary alcohols. A key design element was the incorporation of a tryptophan residue in the peptide side chain for promoting π-stacking between peptide side chain and the pyridiniumring of the N-acyl intermediate, in which modelling was used as a structure-based guiding tool. Together, a catalyst containing a LeuTrp-N-Boc
Iron-catalyzed asymmetric hydrosilylation of ketones
作者:Ziqing Zuo、Lei Zhang、Xuebing Leng、Zheng Huang
DOI:10.1039/c5cc00612k
日期:——
iminopyridine-oxazoline (IPO) ligands have been synthesized. The most sterically hindered iron catalyst exhibits excellent activity (up to 99% yield) and high enantioselectivity (up to 93% ee) in asymmetrichydrosilylation of aryl ketones.
achiral electron-rich mono-phosphine ligand, catalyzes efficient asymmetric hydrogenation of a wide range of aryl ketones, affording chiral alcohols with high yields and moderate to excellent enantioselectivities (29 examples, up to 93% ee). Notably, the achiral mono-phosphine ligand shows a remarkable effect on the enantioselectivity of the reaction.
Catalytic Hydrosilylation of
Carbonyl Compounds with Zinc(II) Acetate: Asymmetric Induction Collaborated
with N<sub>2</sub>S<sub>2</sub> Ligands
作者:Hisao Nishiyama、Tomohiko Inagaki、Yoko Yamada、Le Thanh Phong、Akihiro Furuta、Jun-ichi Ito
DOI:10.1055/s-0028-1087663
日期:——
Zincacetate proved to be an efficient catalyst for hydro-silylationof ketones and aldehydes in the combination with (EtO) 2 MeSiH,and a good to excellent asymmetric induction was observed in thepresence of chiral N 2 S 2 ligands.
乙酸锌与(EtO) 2 MeSiH 结合被证明是酮和醛氢化硅烷化的有效催化剂,并且在手性N 2 S 2 配体的存在下观察到良好至极好的不对称诱导。