occurrence of chiral induction involving a hydrogen–hydrogen interaction between a hydride on the iridium atom and the substituent on the oxazoline ring of the ligand, and on the basis of the calculations, we proposed a catalytic cycle involving only Ir(III), which differs from the Ir(III)/Ir(V) catalytic cycle that operates in the hydrogenation of α,β-unsaturated carboxylic acids.
[EN] PROCESS FOR THE PREPARATION OF DIMIRACETAM<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE DIMIRACETAM
申请人:NEUROTUNE AG
公开号:WO2012013640A1
公开(公告)日:2012-02-02
The invention relates to a method of manufacture of dimiracetam (2,5-dioxohexahydro-1 H-pyrrolo[1,2-a]imidazole), characterized in that a 4-oxo-butanoic acid ester is condensed with glycinamide in a one-pot reaction with a controlled pH. The reaction may be performed in aqueous solution or in an anhydrous lower alcohol solution.
Synthesis of optically active forms of ipsenol, the pheromone of IPS bark beetles
作者:K. Mori
DOI:10.1016/0040-4020(76)85032-6
日期:1976.1
synthesized from (S)-(+)-leucine 10 and its antipode 10′, respectively. This established the S-configuration of the naturally occurring (-)-ipsenol. Only the natural (S)-(−)-enantiomer was biologically active on Ips grandicollis.
Proton‐Promoted Nickel‐Catalyzed Asymmetric Hydrogenation of Aliphatic Ketoacids
作者:Chen‐Qiang Deng、Jiao Liu、Jia‐Hao Luo、Li‐Jin Gan、Jin Deng、Yao Fu
DOI:10.1002/anie.202115983
日期:2022.4.4
A robust and efficient nickel–phosphine complex has been discovered for the asymmetric hydrogenation of aliphatic ketoacids. A proton promoted the activation of C=O bonds and controlled the stereoselectivity through hydrogen bonds to obtain the corresponding products in high yields with excellent enantioselectivities.