Facile synthesis of 1,2,4-triazolines via PPh3-triggered reaction of azodicarboxylate with 2-azidoacrylates
摘要:
A convenient method for the synthesis of 1,2,4-triazolines by triphenylphosphine-triggered reaction of dialkyl azodicarboxylate with 2-azidoacrylates is described. The cascade reaction procedure is general and efficient. (C) 2010 Elsevier Ltd. All rights reserved.
Tri- and tetrasubstituted N–H pyrroles were prepared by the simple treatment of vinyl azides with 1,3-dicarbonylcompounds in toluene at 100 °C via 2H-azirine intermediates generated in situ. When the reactions of vinyl azides and 1,3-dicarbonylcompounds were performed in DMF in the presence of a catalytic amount of K2CO3, 1-vinyl-1,2,3-triazoles were obtained via 1,3-dipolar cycloaddition. These
三-和四取代Ñ经由2在100℃下在甲苯中的简单处理乙烯基叠氮化物与1,3-二羰基化合物制备-H吡咯ħ原位产生-azirine中间体。当在催化量的K 2 CO 3存在下,叠氮化乙烯和1,3-二羰基化合物的反应在DMF中进行时,通过1,3-偶极环加成反应获得1-乙烯基-1,2,3-三唑。这些方法利用了叠氮化乙烯基化学反应的正交模式,这可以通过稍微改变反应条件来实现。
Synthesis of Substituted Indoles from 2-Azidoacrylates and <i>ortho</i>-Silyl Aryltriflates
作者:Deng Hong、Zhengbo Chen、Xufeng Lin、Yanguang Wang
DOI:10.1021/ol101934v
日期:2010.10.15
2-Azidoacrylates react with benzynes in the presence of PPh3 and CsF to afford substituted indoles in good yields. The reaction involves the formation of iminophosphorane and benzyne and a subsequent double cyclization/hydrolysis/air-oxidation cascade. This methodology was utilized to synthesize 10H-indolo[1,2-a]indol-10-ones.
Simple and eco-friendly synthesis of polyfunctionalized 2-aminopyrroles from vinyl azides and α-cyano derivatives has been accomplished with a good to excellent yield. The reaction was performed in ethanol/water co-solvent system without catalyst and the workup was facile. A plausible mechanism has been proposed.
Synthesis of pyrazoles from 2-azidoacrylates and hydrazonyl chlorides
作者:Yao Li、Deng Hong、Ping Lu、Yanguang Wang
DOI:10.1016/j.tetlet.2011.05.147
日期:2011.8
A regioselective synthesis of 1,3,4,5-tetrasubstituted pyrazoles is established between 2-azidoacrylates and hydrazonylchlorides in the presence of triethylamine. The yields are moderate (43–73%) and a possible mechanism for this transformation is postulated.
A manganese(II) acetate‐catalyzed domino reaction of vinyl azides and 4‐hydroxycoumarin has been developed for the synthesis of polyfunctionalized spirofuranone‐lactams. A wide range of vinyl azides are capable of providing the desired spirofuranone‐lactams in good to excellent yields. The reaction was achieved via thermal decomposition of vinyl azides to 2H‐azirines, followed by an intramolecular