N-(Propargyl)diazenecarboxamides for ‘click’ conjugation and their 1,3-dipolar cycloadditions with azidoalkylamines in the presence of Cu(II)
作者:Damijana Urankar、Miha Steinbücher、Jaka Kosjek、Janez Košmrlj
DOI:10.1016/j.tet.2010.02.042
日期:2010.4
Propargyl functionalized diazenes 1 were prepared by two different approaches and were examined as alkyne click components in copper-catalyzed azide–alkyne cycloadditions (CuAAC) with 2-(azidomethyl)pyridine 5a and four α-azido-ω-aminoalkanes C2–C5 (5b–e). Whereas the reactions with azidoalkylamines 5b–e reached completion with copper(II) sulfate without the need of reducing agent typically in no more
炔丙基官能化的二氮烯1通过两种不同的方法制备,并在铜催化的叠氮化物-炔烃环加成(CuAAC)中与2-(叠氮甲基)吡啶5a和四个α-叠氮基-ω-氨基链烷烃C2-C5(5b – e)。与叠氮基烷基胺5b - e的反应通常用硫酸铜(II)在不需要还原剂的情况下通常在不超过几分钟的时间内完成,而2-(叠氮甲基)吡啶5a需要添加金属铜和更长的反应时间(2 –24小时)。研究了反应性的这种差异,并根据其对CuAAC的碱效应和邻近效应进行了研究。