Enantioselective N-Heterocyclic Carbene Catalyzed Synthesis of Functionalized Indenes
作者:Changhe Zhang、David W. Lupton
DOI:10.1021/acs.orglett.7b01981
日期:2017.9.1
An enantioselective NHC (N-heterocycliccarbene) catalyzed synthesis of indenes from bifunctional α,β-unsaturated acyl fluorides and TMS enol ethers has been discovered. The reaction has broad generality (31 examples) and proceeds with high levels of enantioselectivity (most >92:8 er). Mechanistically the reaction likely occurs via a Michael/β-lactonization/decarboxylation sequence. Derivatization
Phthalides by Rhodium-Catalyzed Ketone Hydroacylation
作者:Diem H. T. Phan、Byoungmoo Kim、Vy M. Dong
DOI:10.1021/ja907711a
日期:2009.11.4
phthalides by using enantioselective ketone hydroacylation. In the presence of Rh[(Duanphos)]X (X = NO(3), OTf, OMs), various 2-ketobenzaldehydes undergo intramolecularhydroacylation to produce phthalide products in good yields and 92-98% ee's. Our study highlights the key role counterions play in controlling both reactivity and enantioselectivity. A concise asymmetric total synthesis of the celery extract
Investigation of Peptide Labeling with <i>ortho</i>-Phthalaldehyde and 2-Acylbenzaldehyde
作者:Fan Xiao、Mengze Sun、Liyun Zhang、Xiaoguang Lei
DOI:10.1021/acs.joc.3c01397
日期:——
ortho-Phthalaldehyde (OPA) with high reactivity to the amine group has been widely used to modify proteins. We discovered new modifications of OPA and 2-acylbenzaldehyde and proposed the reaction mechanism. Using isotope labeling mass spectrometry-based experiment, we identified new cross-linking properties of OPA and 2-acylbenzaldehyde. This reactivity revealed that OPA has the potential to probe
Cobalt-Catalyzed Enantioselective Intramolecular Hydroacylation of Ketones and Olefins
作者:Junfeng Yang、Naohiko Yoshikai
DOI:10.1021/ja509919x
日期:2014.12.3
Cobalt-chiral diphoshine catalytic systems promote intramolecular hydroacylation reactions of 2-acylbenzaldehydes and 2-alkenylbenzaldehydes to afford phthalide and indanone derivatives, respectively, in moderate to good yields with high enantioselectivities. The ketone hydroacylation did not exhibit a significant H/D kinetic isotope effect (KIE) with respect to the aldehyde C-H bond, indicating that C-H activation would not be involved in the rate-limiting step.
[EN] METHOD FOR PREPARING AMINES FROM ALDEHYDES AND KETONES BY BIOCATALYSIS<br/>[FR] PROCÉDÉ DE PRÉPARATION D'AMINES À PARTIR D'ALDÉHYDES ET DE CÉTONES PAR BIOCATALYSE
申请人:COMMISSARIAT ENERGIE ATOMIQUE
公开号:WO2019008110A1
公开(公告)日:2019-01-10
The present invention relates to the preparation of amines from aldehydes and ketones by reductive amination with enzymes having a reductive aminase activity on aldehydes and ketones devoid of any carboxyl group gamma of the carbonyl group. The invention also relates to the enzymes per se and their uses in biocatalysis. The enzymes are derived from Mycobacterium smegmatis and vaccae, Cystobacter fuscus, Microbacterium sp. and Aminomonas paucivorans.