Decarbonylative Approach to the Synthesis of Enamides from Amino Acids: Stereoselective Synthesis of the (<i>Z</i>)-Aminovinyl-<scp>d</scp>-Cysteine Unit of Mersacidin
作者:Pablo García-Reynaga、Angela K. Carrillo、Michael S. VanNieuwenhze
DOI:10.1021/ol203399x
日期:2012.2.17
The Pd- and Ni-promoted decarbonylation of aminoacid thioesters proceeds smoothly to yield enamides. The synthesis of the (S)-(Z)-AviMeCys subunit of mersacidin, an MRSA-active lantibiotic, via this approach, is described.
Pd 和 Ni 促进的氨基酸硫酯脱羰反应顺利进行,生成烯酰胺。描述了通过这种方法合成MRSA 活性羊毛硫抗生素 meRSAcidin的 ( S )-( Z )-AviMeCys 亚基。
Enamides Accessed from Aminothioesters via a Pd(0)-Catalyzed Decarbonylative/β-Hydride Elimination Sequence
作者:Geanna K. Min、Dácil Hernández、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/ol101620r
日期:2010.11.5
A facile synthesis of various enamides from aminothioesters via a palladium(0)-catalyzed decarbonylation/β-hydride elimination is reported. This protocol was applied to mercaptopyridyl C-terminal modified peptides for the generation of enamides without epimerization at stereogenic centers.
A Synthetic Approach to <i>N</i>-Aryl Carbamates via Copper-Catalyzed Chan–Lam Coupling at Room Temperature
作者:Soo-Yeon Moon、U. Bin Kim、Dan-Bi Sung、Won-Suk Kim
DOI:10.1021/jo502828r
日期:2015.2.6
catalyst. The reaction proceeds readily in an open flask at room temperature without additional base, ligand, or additive. Rapid access to urea analogues via a two-step one-pot procedure is enabled by reacting N-arylcarbamates with aluminum–amine complexes. In addition, among several boronic acid derivatives prepared, dimethylphenyl boronate was found to react rapidly in its reaction with benzyl azidoformate
Ambient Temperature Synthesis of High Enantiopurity <i>N</i>-Protected Peptidyl Ketones by Peptidyl Thiol Ester−Boronic Acid Cross-Coupling
作者:Hao Yang、Hao Li、Rüdiger Wittenberg、Masahiro Egi、Wenwei Huang、Lanny S. Liebeskind
DOI:10.1021/ja0658719
日期:2007.2.1
alpha-Amino acidthiol esters derived from N-protected mono-, di-, and tripeptides couple with aryl, pi-electron-rich heteroaryl, or alkenyl boronic acids in the presence of stoichiometric Cu(I) thiophene-2-carboxylate and catalytic Pd(2)(dba)(3)/triethylphosphite to generate the corresponding N-protected peptidyl ketones in good-to-excellent yields and in high enantiopurity. Triethylphosphite plays
在化学计量的 Cu(I) 噻吩-2-羧酸盐和催化作用下,衍生自 N-保护的单肽、二肽和三肽的 α-氨基酸硫羟酸酯与芳基、富含 π 电子的杂芳基或烯基硼酸偶联Pd(2)(dba)(3)/亚磷酸三乙酯生成相应的 N 保护肽基酮,产率和对映体纯度都非常好。亚磷酸三乙酯通过减轻不希望的钯催化脱羰-β-消除α-氨基硫羟酸酯,作为支持配体发挥关键作用。肽基酮的合成在室温下非碱性条件下进行,并表现出对功能的高度耐受性。
Role of Donor–Acceptor Cyclopropenes in Metal Carbene Reactions. Conversion of <i>E</i>-Substituted Enoldiazoacetates to <i>Z</i>-Substituted Metallo-Enolcarbenes
作者:Kuiyong Dong、Kostiantyn O. Marichev、Michael P. Doyle
DOI:10.1021/acs.organomet.9b00427
日期:2019.10.28
vinylcarbene cycloaddition reactions. These reactions often occur with the intervention of donor–acceptor (D-A) cyclopropenes that can serve as metal carbene sources. Pathways to cycloaddition products that occur with and without D-A cyclopropene involvement have been identified. E-γ-Substituted enoldiazoacetates do not undergo cycloaddition reactions unless they first form D-A cyclopropene intermediates. When