Hydroxylamine‐Derived Reagent as a Dual Oxidant and Amino Group Donor for the Iron‐Catalyzed Preparation of Unprotected Sulfinamides from Thiols
作者:Sayanti Chatterjee、Szabolcs Makai、Bill Morandi
DOI:10.1002/anie.202011138
日期:2021.1.11
An iron catalyzed reaction for the selective transformation of thiols (‐SH) to sulfinamides (‐SONH2) by a direct transfer of ‐O and free ‐NH2 groups has been developed. The reaction operates undermildconditions using a bench stable hydroxylamine derived reagent, exhibits broad functional group tolerance, is scalable and proceeds without the use of any precious metal catalyst or additional oxidant
Thiol- and Disulfide-Containing Vancomycin Derivatives Against Bacterial Resistance and Biofilm Formation
作者:Inga S. Shchelik、Karl Gademann
DOI:10.1021/acsmedchemlett.1c00455
日期:2021.12.9
growing issue. Use of the last-resort antibiotic vancomycin is under threat due to the increasing appearance of vancomycin-resistant bacteria as well as the formation of biofilms. Herein, we report a series of novel vancomycin derivatives carrying thiol- and disulfide-containing moieties. The new compounds exhibited enhanced antibacterial activity against a broad range of bacterial strains, including
exposure may accelerate subsequent proton reduction under visible light irradiation (λ > 420 nm). The hydrogenevolution rate (HER) and apparent quantum yield (AQY) at 420 nm of modified CMPs were increased up to 27.2 times and 47.1 times in comparison to those of original CMPs. Photocatalytic H2 evolution activity evaluation of BBT-SC2CH3, BBT-SC2N(CH3)2 and SC2NHAc in which amino groups were replaced
Development and characterization of functionalized glyco thiolate capped gold nanoparticles for biological applications
作者:Christian K. Adokoh、Frankline K. Keter、Henok H. Kinfe、Robert Tshikhudo、James Darkwa
DOI:10.1039/c9md00493a
日期:——
transmission electron microscopy (TEM) were used for physical and chemical characterization of all the resultant AuNPs. The ζ-potential studies of AuNPs prepared through the direct method revealed that the surface charge is dependent on the length of the alkyl unit of (C6H11O6)NH(CH2)nCH2S− ligands. TEM images of the acetylated and non-acetylated glyco thiolate capped gold nanoparticles (AuNPs G6–G11) prepared
水分散体中的糖基金纳米粒子(AuNPs)通过两种方法制备,即直接还原法和配体取代法。在直接法中,糖硫醇的钾盐,通式为(C 6 H 11 O 6 )NH(CH 2 ) n CH 2 SK(其中L1,n =1;L2,n =2;L3,n = 3、L4,n = 4;L5,n = 5),用作还原剂和封端剂,得到乙二醇硫醇封端的金纳米颗粒(AuNPs G1 – G5);同时在配体交换实验中,L1 – L5及其乙酰化形式(L6 – L8)取代了柠檬酸盐封端的金纳米颗粒中的柠檬酸根离子,得到额外的 AuNPs G6 – G11。使用紫外-可见光谱、表面电荷(电位)测量和透射电子显微镜 (TEM) 对所有所得 AuNP 进行物理和化学表征。通过直接法制备的 AuNPs 的z电位研究表明,表面电荷取决于 (C 6 H 11 O 6 )NH(CH 2 ) n CH 2 S -配体的烷基单元的长度。通过配体交换法
Ratschinskii et al., Zhurnal Obshchei Khimii, 1958, vol. 28, p. 2998,3001,3002;engl.Ausg.S.3027,3028,3030