Toward Enediyne Mimics: Methanolysis of Azoesters and a Bisazoester
作者:Veeraraghavan Srinivasan、David J. Jebaratnam、David E. Budil
DOI:10.1021/jo990750v
日期:1999.7.1
Enediyne anticancer antibiotics have attracted tremendous interest in the past decade. The inherent difficulty in synthesizing these structurally complex natural products with the strained enediyne moiety has motivated a search for simpler molecules that mimic enediyne chemistry. The ultimate objective is to identify molecules that produce 1,4-benzenoid diradicals, which are known to induce DNA cleavage in the natural products. Toward this goal, several aromatic azoesters have been synthesized, and EPR reveals the presence of radical intermediates in their methanolysis. A 1,4-bisazoester has also been synthesized, and its methanolysis products have been studied by reversed-phase HPLC. The formation of 1,2-dicyanobenzene from the 1,4-bisazoester is consistent with the existence of a 1,4-diradical intermediate.
N-(Propargyl)diazenecarboxamides for ‘click’ conjugation and their 1,3-dipolar cycloadditions with azidoalkylamines in the presence of Cu(II)
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
Visible-light-driven SAQS-catalyzed aerobic oxidative dehydrogenation of alkyl 2-phenylhydrazinecarboxylates
作者:Van Hieu Tran、Hee-Kwon Kim
DOI:10.1039/d2ra05842a
日期:——
organic chemistry. Here, a novel visible-light-driven oxidative dehydrogenation of alkyl 2-phenylhydrazinecarboxylates is used for the synthesis of azo compounds. This synthetic method was conducted under an aerobic environment with mild reaction conditions. Sodium anthraquinone sulfonate (SAQS) was employed as the crucial organic photocatalyst in a visible-light-driven reaction to generate various azo compounds