Propargyl-Assisted Selective Amidation Applied in C-terminal Glycine Peptide Conjugation
作者:Kenward King Ho Vong、Satoshi Maeda、Katsunori Tanaka
DOI:10.1002/chem.201604247
日期:2016.12.23
nucleophilic acyl substitution reactions. Herein, we report an unusual observation in which glycine propargyl ester derivatives displayed selective, base‐independent reactivity towards linear alkylamines under mild, metal‐free conditions. Through global reaction route mapping (GRRM) modeling calculations, it is predicted that these observations may be governed by factors related to hydrogen‐bonding and intermolecular
Synthesis of <i>C</i>-Propargylic Esters of N-Protected Amino Acids and Peptides
作者:Sean P. Bew、Glyn D. Hiatt-Gipson
DOI:10.1021/jo100537q
日期:2010.6.4
critical importance of aminoacids in organic synthesis as well as their myriad of applications in “click” chemistry it is interesting to note that the synthesis of C-propargyl derived aminoacidesters has not been particularly well served. We report a convenient, straightforward, and high-yielding synthesis of structurally diverse C-propargyl-derived N-protected aminoacidesters.
terminal alkynes, and internal alkynes is reported. The reaction is initiated with a chemoselective copper-catalyzed azide alkyne cycloaddition (CuAAC) followed by a palladium-catalyzed incorporation of an internal alkyne. The simple one-pot procedure introduces C–H functionalization to the growing field of multicomponent multicatalytic reactions ((MC)2R). With inexpensive CuI and the Herrmann–Beller
报告了一种可靠的方法,用于有机叠氮化物,末端炔烃和内部炔烃的双金属催化组合。该反应通过化学选择性铜催化的叠氮化物炔烃环加成反应(CuAAC)引发,然后钯催化的内部炔烃掺入。简单的一锅法将C–H功能化引入了多组分多催化反应((MC)2 R)的不断发展的领域。用廉价的CuI和Herrmann-Beller钯环烷作为催化剂,可生成四个键和两个杂环,其中HI为唯一的副产物。所有组分的广泛应用范围展示了这种多功能的转变,从而导致了一类新型的全取代多环三唑。1个1 H NMR和氘标记研究为洞悉铜和钯步骤的速率差异提供了见识。
<scp>Copper‐Catalyzed</scp> Highly Stereoselective Hydrodifluoroallylation of Cyclopropenes and Alkenyl Boronates with 3,<scp>3‐Difluoroallyl</scp> Sulfonium Salts<sup>†</sup>
作者:Xing Gao、Xiaoxiao Ren、Wei Deng、Xingang Zhang
DOI:10.1002/cjoc.202300436
日期:2023.12.15
asymmetric fluoroalkylation with ubiquitous alkenes. The advantages of this protocol are synthetic convenience, high functional group tolerance, and the synthetic versatility of the resulting gem-difluoroallyl cyclopropanes and borylalkanes. The synthetic utility of this approach has also been demonstrated by the diversified transformations of the gem-difluoroallylated products and the rapid synthesis of bioactive
Neighboring Carbonyl Group Assisted Oxyacetoxylation of Propargylic Carboxylates with Retention of Chirality under Metal Free Condition
作者:Tapas R. Pradhan、Debendra K. Mohapatra
DOI:10.1002/adsc.201900314
日期:2019.8.5
reaction proceeds through the intramolecular nucleophilic attack of the neighboring carbonyl group on an alkynyliodonium intermediate. The process is general with broad substrate scope and is amenable for application to a variety of propargyl carboxylates including those obtained from naturalproducts. Insight into the mechanistic pathway by isotopic labelling (using H2O18 and D2O) and controlled experiments
提出了保留手性的伯,仲和叔炔丙基羧酸的无金属氧乙酰氧基化方法。该反应通过烷基炔酮中间体上相邻羰基的分子内亲核攻击而进行。该方法是一般的,具有广泛的底物范围,并且适用于包括从天然产物获得的那些炔丙基羧酸酯。通过同位素标记(使用H 2 O 18和D 2 O)洞察机械途径,并确认了对照实验。