Manganese‐catalyzed CH functionalization reactions of ketimines set the stage for the expedient synthesis of cis‐β‐amino acid estersthrough site‐ and regioselective alkene annulations. The organometallic CHactivation occurred efficiently with high functional group tolerance, delivering densely functionalized β‐amino acid derivatives with ample scope.
作者:Weiping Liu、Sven C. Richter、Yujiao Zhang、Lutz Ackermann
DOI:10.1002/anie.201601560
日期:2016.6.27
The first manganese(I)‐catalyzed C−H allylations with ample scope were achieved by carboxylate assistance. The highly selective C−H/C−O functionalizations proved viable with densely substituted allyl carbonates, and the organometallic C−H allylation strategy set the stage for expedient late‐stage diversification with excellent levels of positional selectivity.
通过羧酸盐的辅助作用,第一个锰(I)催化的CH烯丙基化作用范围很大。事实证明,高选择性的C / H / C-O功能化可用于稠密取代的碳酸烯丙酯,有机金属的C-H烯丙基化策略可为后期分散化提供有利的条件,并具有出色的位置选择性。
Oxidative Kinetic Resolution of Acyclic Amines Based on Equilibrium Control
An oxidative kinetic resolution of racemic acyclic amines was developed using an imine derivative as the resolving reagent and chiral phosphoric acid as the catalyst to give enantiomers in good yields with high to excellent enantioselectivities. The key to success of the title reaction was the equilibrium control by adjusting the ratio of the resolving reagent, and unique enantiodivergence was observed
Hβ Catalyzed Condensation Reaction Between Aromatic Ketones and Anilines: To Access Ketimines (Imines)
作者:Vasu Amrutham、Naresh Mameda、Srujana Kodumuri、Durgaiah Chevella、Rammurthy Banothu、Krishna Sai Gajula、Nellya Gennadievna Grigor’eva、Narender Nama
DOI:10.1007/s10562-017-2196-0
日期:2017.12
A simple approach for the formation of imines by condensation of ketones and anilines over heterogeneous catalyst (Hβ zeolite) has been successfully developed. The present catalytic system scope was explored for various aromatic ketones and anilines. Furthermore, Hβ zeolite can be easily separable and recycled several times (five times) without considerable loss of its catalytic activity.Graphical
A new class of chiral Lewis bases for the enantioselective HSiCl3‐mediated reduction of imines was developed. Through extensive catalyst structure optimization, an extremely active species was identified that was able to promote the reduction of a large variety of functionalized substrates in high yields with enantioselectivities typically above 90 % with catalyst loadings as low as 0.1–1 mol %. The