Synthesis of Novel Branched Nucleoside Dimers Containing a 1,2,3-Triazolyl Linkage
摘要:
Three branched nucleoside dimers containing a 1,2,3-triazole linkage have been synthesized using 1,3-dipolar cycloaddition of N-3 or C-5 acetylene nucleosides with 3'-azido3'-deoxythymidine.
γ-Carboline AC190 analogues via palladium catalysed allene insertion stereo and regioselective 3- and 5-component cascades
作者:H. Ali Dondas、Aiden Hempshall、Sarah Narramore、Colin Kilner、Colin W.G. Fishwick、Ronald Grigg
DOI:10.1016/j.tet.2016.01.025
日期:2016.3
γ-Carbolines were prepared from pyrido[4,3-b]-5H-indoles via Pd(0)-catalysed, stereo and regioselective allene/uridine allene insertion 3- and 5-component cascades. This versatile reaction sequence gives a range of structurally diverse carboline derivatives and tolerates a broad range of substrates. The power of this approach has been harnessed to produce γ-carboline based HDAC inhibitors.
γ-咔啉是由吡啶[4,3- b ] -5 H-吲哚经Pd(0)催化的,立体和区域选择性的烯丙基/尿苷烯丙基插入3-和5-组分级联反应制得的。这种通用的反应顺序可提供一系列结构多样的咔啉衍生物,并能耐受多种底物。该方法的功能已被利用来生产基于γ-咔啉的HDAC抑制剂。
Concise synthesis and antibacterial evaluation of novel 3-(1,4-disubstituted-1,2,3-triazolyl)uridine nucleosides
We report herein a simple and efficient synthesis of a new series of antibacterial uridine nucleosides. The strategy involved a sequential silylation/N‐glycosylation/N‐propargylation procedure of uracil 1 for preparing the dipolarophile 5 in good yield. A series of novel uridine‐[1,2,3]triazole nucleosides 6a–j were efficiently synthesized via the copper‐catalyzed azide–alkyne cycloaddition (CuAAC)
A novel aqueous iodination system was developed for the synthesis of 5-iodo-1,2,3-triazoles under air. This reaction system has high efficiency and excellent chemo-selectivity with wide functional group tolerance. In addition, this method can be utilized for the modification of biomolecules such as riboses and nucleosides, and for the double labeling of biomolecules when coupled with other reaction
direct modification of bioactive molecules in water. Through the combination of water‐compatible oxidative iodination and the copper‐catalyzed alkyne–azide cycloaddition reaction, a novel copper‐catalyzed aqueous multicomponent synthetic method for the preparation of 5‐iodo‐1,2,3‐triazoles has been developed. The method is highly effective and selective for substrates including biologically relevant