Ester Synthesis in Water: <i>Mycobacterium smegmatis</i>
Acyl Transferase for Kinetic Resolutions
作者:Nicolas de Leeuw、Guzman Torrelo、Carolin Bisterfeld、Verena Resch、Luuk Mestrom、Emanuele Straulino、Laura van der Weel、Ulf Hanefeld
DOI:10.1002/adsc.201701282
日期:2018.1.17
The acyl transferase from Mycobacterium smegmatis (MsAcT) catalyses transesterification reactions in aqueous media because of itshydrophobic active site. Aliphatic cyanohydrin and alkyne esters can be synthesised in water with excellent and strikingly opposite enantioselectivity [(R);E>37 and (S);E>100, respectively]. When using this enzyme, the undesired hydrolysis of the acyl donor is an important
A Boron–Oxygen Transborylation Strategy for a Catalytic Midland Reduction
作者:Kieran Nicholson、Joanne Dunne、Peter DaBell、Alexander Beaton Garcia、Andrew D. Bage、Jamie H. Docherty、Thomas A. Hunt、Thomas Langer、Stephen P. Thomas
DOI:10.1021/acscatal.0c05168
日期:2021.2.19
The enantioselective hydroboration of ketones is a textbook reaction requiring stoichiometric amounts of an enantioenriched borane, with the Midland reduction being a seminal example. Here, a turnover strategy for asymmetric catalysis, boron–oxygen transborylation, has been developed and used to transform the stoichiometric boranereagents of the Midland reduction into catalysts. This turnover strategy
The novel, chiral, hostcompounds 8 and 9 were derivedfrom tartaric acid. Inclusion complexation with these hostcompounds permitted highly efficient resolution of some aliphatic alcohols (10−13). The symmetrical dimer hostcompound 8 is effective for optical resolution of alcohols 10, 12, and 13 by a combination of enantioselective inclusion complexation and distillation techniques. The unsymmetrical
phosphoric acids (CPAs) and their salts are the privileged catalysts in a plethora of asymmetric transformations. All of the scaffolds of efficient CPAs rely on C2-symmetry and axial chirality, while the only examples of punctually chiral CPAs are TADDOL derivatives. Herein, we present the design and the synthesis of C2-symmetric cycloglycerophosphates (cGPAs) and their application throughout the addition
The effect of catechin derivatives on the enantioselectivity of lipase-catalyzed hydrolyses of alkynol benzoate esters
作者:Kaoru Nakamura、Keishi Takenaka
DOI:10.1016/s0957-4166(02)00121-0
日期:2002.3
Polyphenols. such as (+)-catechin and pyrogallol could be used to enhance stereochemical control in the lipase-catalyzed hydrolysis of alkynol benzoate esters, leading to increased enantioselectivities in the kinetic resolution of alkynols with lipase, Amano AH. (C) 2002 Elsevier Science Ltd. All rights reserved.