研究了在固-液相转移催化条件下,通过烷基化,迈克尔加成和羰基加成以及甘氨酸和丙氨酸酯衍生的亚胺与苯甲醛环加成,合成短而温和高效的α-氨基酸的路线。固液相转移催化反应的关键是为各种反应物选择碱。产量取决于所用的碱。讨论了使用KOH,K 2 CO 3和Na 2 CO 3获得的结果。研究了固液PTC苄基化反应的动力学,我们提出了一种可能的固液PTC机理作为界面自动催化程序。介绍了一些α-氨基酸合成的细节。
N-Substituted 3-Acetyltetramic Acid Derivatives as Antibacterial Agents
作者:Raghunandan Yendapally、Julian G. Hurdle、Elizabeth I. Carson、Robin B. Lee、Richard E. Lee
DOI:10.1021/jm701356q
日期:2008.3.13
expand the structure-activity relationship of tetramic acid molecules with structural similarity to the antibiotic reutericyclin, 22 compounds were synthesized and tested against a panel of clinically relevant bacteria. Key structural changes on the tetramic acid core affected antibacterial activity. Various compounds in the N-alkyl 3-acetyltetramic acid series exhibited good activity against Gram-positive
Scandium(III)‐Zeolites as New Heterogeneous Catalysts for Imino‐Diels–Alder Reactions
作者:Andrea Olmos、Benoit Louis、Patrick Pale
DOI:10.1002/chem.201103624
日期:2012.4.16
demonstrates the first zeolite‐catalyzed synthesis of piperidine derivatives, including peptidomimetics and indoloquinolizidine alkaloids. The approach developed utilizes a highly effective one‐pot reaction cascade, through imine formation and imino‐Diels–Alderreactions, promoted by scandium‐loaded zeolites as a heterogeneouscatalyst. The methodology described benefits from very low catalyst loadings (≤5 mol %
Anchored Palladium Complex‐Generated Clusters on Zirconia: Efficiency in Reductive
<i>N</i>
‐Alkylation of Amines with Carbonyl Compounds under Hydrogen Atmosphere
generation method of palladium clusters and catalytic reductive N-alkylation of amines with carbonyl compounds are reported. The active Pd species are formed by treatment of highly dispersed molecular palladiumcomplexes with atmospheric hydrogen, and the present catalyst system shows a broad substrate scope and functional group tolerance with respect to both amines and carbonyl compounds.
The Catalysis and Asymmetric Induction of Chiral Reverse Micelle: Synthesis of Optically Active α-Amino Acids
作者:Peipei Sun、Yongmin Zhang
DOI:10.1080/00397919708005465
日期:1997.12
Abstract: Through alkylation of N-benzylideneglycine ethyl ester in chiral reverse micelle, followed by hydrolysis of the resulting products, optically active α-amino acids were synthesized.
-glucopyranose or from various amino acid esters react with Fe2(CO)9 to give chiral iron carbonyl complexes. Derivatives produced from benzaldehyde react via a C–H activationreaction in ortho-position with respect to the exocyclic imine substituent followed by an intramolecular hydrogen transfer reaction of the activated hydrogen towards the former imine carbon atom. The molecular structure of the diiron