<sup>
<i>t</i>
</sup>BuOLi-promoted terminal alkyne functionalizations by aliphatic thiols and alcohols
作者:Milan Pramanik、Ashis Mathuri、Prasenjit Mal
DOI:10.1039/d2ob00079b
日期:——
Selective radical addition to terminal alkynes is always a difficult task to achieve because it gives a mixture of stereo- and regioisomers. Herein we describe the selective addition of aliphatic thiols or alcohols to N-phenylpropiolamides (terminal alkynes) using lithium tert-butoxide (tBuOLi) in ethanol as a promoter. Mechanistically, it has been shown that the reaction proceeded through the generation
对末端炔烃进行选择性自由基加成始终是一项艰巨的任务,因为它会产生立体异构体和区域异构体的混合物。在本文中,我们描述了使用乙醇中的叔丁醇锂 ( t BuOLi) 作为促进剂,将脂肪族硫醇或醇选择性添加到N-苯基丙酰胺(末端炔烃)中。从机理上看,反应通过生成硫基自由基中间体进行,N-苯基丙酰胺中的酰胺基团有助于炔烃的活化,从而通过形成 ( Z )-选择性而导致硫缩醛化。抗马尔科夫尼科夫乙烯基硫化物。( Z)-乙烯基硫化物形成过程中的选择性受分子内硫⋯氧相互作用的控制。
Facile Synthesis of Homodimeric Protein Ligands
作者:Weijun Gui、Thomas Kodadek
DOI:10.1002/cbic.202300392
日期:2023.9.15
Bivalent ligands can engage homodimeric protein targets with high affinity due to avidity effects. This study shows that compounds conjugated to a masked formyl acetamide can be coupled efficiently and conveniently through trifluoroacetic acid (TFA)-catalyzed pyridone formation. In most cases, the product is produced in nearly quantitative yield and in excellent purity. The reaction is tolerant of