Cascade Reaction by Chemo- and Biocatalytic Approaches to Obtain Chiral Hydroxy Ketones and <i>anti</i>
1,3-Diols
作者:Raffaella Gandolfi、Giorgio Facchetti、Michael S. Christodoulou、Marco Fusè、Fiorella Meneghetti、Isabella Rimoldi
DOI:10.1002/open.201800056
日期:2018.5
biocatalytic cascade approach was applied for the stereoselectivesynthesis of hydroxy ketones and the corresponding 1,3‐diols. A new class of tridentate N,N,O ligands was used with copper(II) complexes for the asymmetric β‐borylation of α,β‐unsaturated compounds. The complex containing ligand L5 emerged as the best performer, and it gave the organoborane derivatives with good ee values. The corresponding keto–alcohol
Catalytic 1,3-Difunctionalisation of Organic Backbones through a Highly Stereoselective, One-Pot, Boron Conjugate-Addition/Reduction/Oxidation Process
作者:Cristina Solé、Amolak Tatla、Jose A. Mata、Andrew Whiting、Henrik Gulyás、Elena Fernández
DOI:10.1002/chem.201102081
日期:2011.12.9
enantioselectivity provided by the CuI catalyst modified with Josiphos‐ and Mandyphos‐type ligands has been examined. The oxidative substitution of the boryl unit with a hydroxyl group proceeds with complete retention of configuration at the Cβ‐atom. In parallel, the stoichiometric reduction of the imino or carbonyl group provides a second stereogenic centre. Depending on the nature of the reducing reagent
Sequential and Modular Synthesis of Chiral 1,3-Diols with Two Stereogenic Centers: Access to All Four Stereoisomers by Combination of Organo- and Biocatalysis
Biocompatible: A modular chemoenzymatic synthesis (see scheme) based on asymmetric organo‐ and biocatalytic reaction sequences allows the sequential construction of both stereogeniccenters of 1,3‐diols and leads to allfour possible stereoisomers in enantiomerically pure form. The biocompatibility of the organocatalytic aldol reaction allows its direct use in the subsequent enzymatic reduction without
One-pot Chemoenzymatic Synthesis of Chiral 1,3-Diols Using an Enantioselective Aldol Reaction with Chiral Zn2+ Complex Catalysts and Enzymatic Reduction Using Oxidoreductases with Cofactor Regeneration
reported on enantioselectivealdolreactions of acetone and some aldehydes catalyzed by chiralZn2+ complexes of L‐prolyl‐pendant [12]aneN4 (L‐ZnL1) and L‐valyl‐pendant [12]aneN4 (L‐ZnL2) in aqueous solution. Here, we report on the one‐pot chemoenzymaticsynthesis of chiral 1,3‐diols in an aqueous solvent system at room temperature by a combination of enantioselectivealdolreactions catalyzed by Zn2+ complexes
Stereoselective catalytic tishchenko reduction of β-hydroxyketones using scandium triflate
作者:Kevin M. Gillespie、Ian J. Munslow、Peter Scott
DOI:10.1016/s0040-4039(99)01986-3
日期:1999.12
A number of aliphatic and aromatic beta-hydroxyketones were reduced to 1,3-diol monoesters by aldehydes in the presence of a catalytic amount of scandium triflate. Chiral substrates were reduced with high 1,3-anti diastereoselectivity. (C) 1999 Elsevier Science Ltd. All rights reserved.