Derivatized Amino Acids Relevant to Native Peptide Synthesis by Chemical Ligation and Acyl Transfer
摘要:
Three amino acids were converted into the derivatives 5.2 (from glycine), 6.4a and 6.4b (from alanine), and 8.3a and 8.3b (from O-benzyl serine). These N-alkylated amino acids, which can be deprotected after conversion of the carboxyl into an amide, correspond to the general structure 2.1, a compound class of use in the study of peptide segment coupling by the ligation-acyl transfer method.
A Convenient Synthesis of Thioacetates and Thiobenzoates Using Silica-Gel Supported Potassium Thioacetate
作者:Tadashi Aoyama、Toshio Takido、Mitsuo Kodomari
DOI:10.1081/scc-120025193
日期:2003.11
Abstract A simple and efficient procedure has been developed for the synthesis of thioesters by a reaction of alkyl halides with silica-gel supported potassium thioacetate or thiobenzoateunder mild conditions.
Unsymmetrical Disulfides Synthesis
<i>via</i>
Cs
<sub>2</sub>
CO
<sub>3</sub>
‐Catalyzed Three‐Component Reaction in Water
作者:Dungai Wang、Yuanji Gao、Yunli Tong、Mingteng Xiong、Xiao Liang、Heping Zhu、Yuanjiang Pan
DOI:10.1002/adsc.202000851
日期:2020.11.18
An unsymmetrical disulfides synthesis by Cs2CO3‐catalyzedthree‐component coupling reaction of thioacetate, sodium thiosulfate, and benzyl halide in water is described. The safe, stable, and non‐toxic Na2S2O3 was invoked as the sulfur‐source, successfully avoiding the odor generation in the process of S−S bond formation. A wide range of substrate suitability and appropriate functional group tolerance
描述了由Cs 2 CO 3催化的硫代乙酸盐,硫代硫酸钠和苄基卤化物在水中的三组分偶联反应合成的不对称二硫化物。安全,稳定且无毒的Na 2 S 2 O 3被用作硫源,成功避免了在S-S键形成过程中产生的气味。观察到广泛的底物适应性和适当的官能团耐受性用于转化。值得注意的是,此处报道的方法与各种生物分子兼容,包括葡萄糖,香豆素和喹啉酮。
Naphthalimide derivatives containing benzyl-sulfur bond as cleavable photoinitiators for near-UV LED polymerization
作者:Xiuyuan Hu、Jia Yu、Shengling Jiang、Yanjing Gao、Fang Sun
DOI:10.1080/17415993.2020.1795175
日期:2020.11.1
substituents located on benzene ring of the benzyl group on photochemical behavior, involving the light absorption properties, potential mechanisms of the photolysis of NABSs under UV LED at 405 nm, and the electron transfer reaction between NABSs and diphenyliodonium hexafluorophosphate (Iod) were investigated in detail. The NABSs have different photolysis mechanisms as compared to PIs containing only an aryl-sulfur
设计并制备了三种含有苄硫键的萘酰亚胺芳基苄硫衍生物 (NABS) 可裂解光引发剂 (PI)。苄基苯环上的苄基硫部分和取代基对光化学行为的影响,涉及光吸收特性、NABSs 在 405 nm UV LED 下光解的潜在机制,以及 NABSs 和 NABSs 之间的电子转移反应。六氟磷酸二苯基碘鎓 (Iod) 进行了详细研究。与仅包含芳基硫键的 PI 相比,NABS 具有不同的光解机制。NABS3 在 405 nm 的 UV LED 曝光下最有效地引发丙烯酸酯单体的自由基光聚合。此外,NABSs/Iod 系统可以引发环氧化物的阳离子光聚合。有趣的是,使用 NABSs 作为 PI 制备的聚合物在 405 nm 的 UV LED 照射下在约 460 nm 处表现出很大的光致发光带。图形概要