Enantiomeric scaffolding of α-tetralone and related scaffolds by EKR (Enzymatic Kinetic Resolution) and stereoselective ketoreduction with ketoreductases
Form with formalin: Scandium‐catalyzed enantioselective hydroxymethylation of ketones has been developed usingaqueousformaldehyde (formalin) in water. The addition of a catalytic amount of pyridine enables the use of ketones directly in asymmetric hydroxymethylation reactions.
Toward Chemistry-Based Design of the Simplest Metalloenzyme-Like Catalyst That Works Efficiently in Water
作者:Taku Kitanosono、Shū Kobayashi
DOI:10.1002/asia.201403004
日期:2015.1
artificial catalysts. Current strategies to rival enzymatic catalysis require unmodified or minimally modified structures of active sites, gigantic molecular weight, and sometimes the use of harsh conditions such as extremely low temperatures in organic solvents. Herein, we describe a design of small molecules that act as the simplest metalloenzyme‐like catalysts that can function in water, without mimicking
Kinetics Studies of the Enantioselective Hydroxymethylation of Silicon Enolates Using Aqueous Formaldehyde in the Presence of Sc(OTf)3 and a Chiral 2,2′-Bipyridine Ligand
The kinetics of chiral scandium(III)‐catalyzed hydroxymethylation of silicon enolates usingaqueousformaldehyde have been investigated, and a reaction mechanism of this process in organic/aqueous medium is proposed.
Chemoenzymatic synthesis and resolution of compounds containing a quaternary stereocenters adjacent to a carbonyl group
作者:Tridib Mahapatra、Nandan Jana、S. Nanda
DOI:10.1016/j.tetasy.2008.04.024
日期:2008.5
Racemic compounds containing a quaternary stereocenter (having hydroxymethyl and alkyl group adjacent to keto functionality) based on chromanone, alpha-tetralone, and indalone scaffolds have been synthesized. An enzymatic irreversible transesterification approach has been applied to generate the pure enantiomers in a stereocontrolled fashion. The pure enantiomers of some alpha,alpha-dialkylated carbonyl compounds have been synthesized by this method. (C) 2008 Elsevier Ltd. All rights reserved.