Asymmetric transfer hydrogenation of ketones catalyzed by rhodium complexes containing amino acid triazole ligands
作者:Fredrik Tinnis、Hans Adolfsson
DOI:10.1039/c0ob00400f
日期:——
Active and selective catalysts for the asymmetric reduction of ketones, under transferhydrogenation conditions, were obtained by combining [RhCl2Cp*]2, with a series of L-amino acid thioamide ligands functionalized with 1,2,3-triazoles. The obtained secondary alcohol products were formed with up to 93% ee.
A convergent synthesis of new β-turn mimics by click chemistry
作者:Keunchan Oh、Zhibin Guan
DOI:10.1039/b606185k
日期:——
Alkyne-azide cycloaddition ("click" chemistry) between two peptide strands derivatized with terminal azide and alkyne, respectively, provides an efficient convergentsynthesis of triazole ring-based new beta-turn mimics.
Synthetic utility of glycosyl triazoles in carbohydrate chemistry
作者:Brendan L. Wilkinson、Laurent F. Bornaghi、Sally-Ann Poulsen、Todd A. Houston
DOI:10.1016/j.tet.2006.06.001
日期:2006.8
We report herein a study of the synthetic utility of the glucosyl triazole moiety in carbohydrate chemistry. A model glucosyl triazole was prepared by a modified Huisgen 1,3-dipolar cycloaddition reaction. The relative rate of cycloaddition was investigated using a variety of alcohol co-solvents and reaction temperatures. It was found that the reaction proceeded with similar efficiency irrespective
Preparation of oxazolines and oxazoles<i>via</i>a PhI(OAc)<sub>2</sub>-promoted cyclization of<i>N</i>-propargylamides
作者:Wei Yi、Qing-Yun Liu、Xing-Xiao Fang、Sheng-Chun Lou、Gong-Qing Liu
DOI:10.1039/c8ob01474d
日期:——
A metal-free cyclization of N-propargylamides for the synthesis of various oxazolines and oxazoles via a 5-exo-dig process is presented. Using (diacetoxyiodo)benzene (PIDA) as a reaction promoter and lithium iodide (LiI) as an iodine source, intramolecular iodooxygenation of N-propargylamides proceeded readily, leading to the corresponding (E)-5-iodomethylene-2-oxazolines in good to excellent isolated
Synthesis and properties of<scp>l</scp>-valine based chiral long alkyl chain appended 1,2,3-triazolium ionic liquids
作者:Roli Mishra、Shubha Pandey、Shruti Trivedi、Siddharth Pandey、Pramod S. Pandey
DOI:10.1039/c4ra05037a
日期:——
l-Valine based alkyl (hexyl, octyl, dodecyl, cetyl, octadecyl) chain-appended 1,2,3-triazolium ionic liquids with iodide/hexafluorophosphate anions are found to possess favourable properties.