An Enzymatic Toolbox for the Kinetic Resolution of 2-(Pyridin-x-yl)but-3-yn-2-ols and Tertiary Cyanohydrins
作者:Giang-Son Nguyen、Robert Kourist、Monica Paravidino、Anke Hummel、Jessica Rehdorf、Romano V. A. Orru、Ulf Hanefeld、Uwe T. Bornscheuer
DOI:10.1002/ejoc.201000193
日期:2010.5
The kineticresolution of a series of acetates of tertiary alcohols bearing a nitrogen substituent has been studied by using several recombinant carboxyl esterases and variants thereof expressed in E. coli. Most of the enzymes were active in the conversion of these tertiary alcohols and excellent enantioselectivities were achieved in the synthesis of three 2-(pyridin-x-yl)but-3-yn-2-ols with the nitrogen
Oxidative radical 1,2-alkylarylation of alkenes with α-C(sp<sup>3</sup>)–H bonds of acetonitriles involving 1,2-aryl migration
作者:Yang Li、Bang Liu、Hai-Bing Li、Qiuan Wang、Jin-Heng Li
DOI:10.1039/c4cc08902b
日期:——
unactivated alkenes with the alpha-C(sp(3))-H bonds of acetonitriles for the synthesis of 5-oxo-pentanenitriles is presented. In the presence of TBPB (tert-butyl peroxybenzoate), a variety of alpha-aryl allylic alcohols underwent the 1,2-alkylarylation reaction with acetonitriles, giving 5-oxo-pentanenitriles in good to excellent yields. This method proceeds via the C(sp(3))-H oxidative coupling with the
Visible-light-induced 1,2-alkylarylation of alkenes with a-C(sp3)–H bonds of acetonitriles involving neophyl rearrangement under transition-metal-free conditions
An efficient visible-light-induced difunctionalization of alkenes with a-C(sp3)–H bonds of nitriles is described for the constructing of diverse 5-oxo-pentanenitriles under transition-metal-free conditions. This protocol proceeds via the functionalization of C(sp3)–H bond and radical addition/intramolecular 1,2-aryl migration processes, which features a wide scope of substituted α,α-diaryl allylic
Regioselective and Stereospecific Rhodium-Catalyzed Allylic Cyanomethylation with an Acetonitrile Equivalent: Construction of Acyclic β-Quaternary Stereogenic Nitriles
作者:Mai-Jan Tom、P. Andrew Evans
DOI:10.1021/jacs.0c02316
日期:2020.7.15
A highlyregioselective and stereospecific rhodium-catalyzed cyanomethylation of tertiary allyliccarbonates for the construction of acyclic β-quaternary stereogenic nitriles is described. This protocol represents the first example of a metal-catalyzed allylicsubstitution reaction using a triorganosilyl-stabilized acetonitrile anion, which permits access to several carbonyl derivatives that are challenging
Visible-Light Photocatalytic Difluoroalkylation-Induced 1, 2-Heteroarene Migration of Allylic Alcohols in Batch and Flow
作者:Xiao-Jing Wei、Timothy Noël
DOI:10.1021/acs.joc.8b01624
日期:2018.9.21
A convenient method for the preparation of sp(3)-rich heterocycles is reported. The method comprises a photocatalytic difluoroalkylation-induced 1,2-heteroarene migration of allylic alcohols. Here we describe for the first time the benefits of using flow to facilitate such migration reactions, including shorter reaction times, higher selectivities, and opportunities to scale the chemistry.