N,1-二芳基-1 H-四唑-5-胺的N-芳基环的Pd(II)催化邻位选择性卤化已通过N-卤代琥珀酰亚胺通过CH键进行卤素活化。目前的工作以5-氨基四唑为导向基团,用于芳烃的化学和区域选择性CH卤代。动力学同位素研究(k H / k D = 2.9)表明,CH键的裂解发生在速率确定步骤中。该协议的范围和机制已得到证明。
Palladium catalyzed carbonylative annulation of the C(sp<sup>2</sup>)–H bond of <i>N</i>,1-diaryl-1<i>H</i>-tetrazol-5-amines and <i>N</i>,4-diaryl-4<i>H</i>-triazol-3-amines to quinazolinones
as both directing as well as intramolecular nucleophiles. The catalytically active C–H activated intermediate dimeric Pd complex was isolated and characterized which on exposure to CO gas gave the corresponding tetrazole fused quinazolinone derivative. On the basis of isolation of the intermediate and observed kinetic isotope effects, a mechanism has been proposed for the C–H activated direct carbonylative
5-aminotetrazoles has been developed by employing simple ketones as substrates. This methodology involved the N2-extrusion/aryl migration of azido complexes as the key step for the in situ generation of carbodiimidium ion, which could further react with hydrazoic acid and cyclize intramolecularly to provide 5-aminotetrazoles in good to excellent yields. In addition, the regioselectivity of the reaction was studied
for the construction of aryl tetrazole amines via desulphurization/substitution/electro cyclization/C-N cross coupling reactions from thiourea with the use of cheap, readily available and air stable copper source as catalyst has been described. The reaction proceeds through the in situ formation of amino tetrazole followed by successive C-N cross-coupling reaction with aryl iodide. Further the temperature
AbstractA highly general, efficient and simple methodology for the regioselective synthesis of aryl tetrazole amines has been explored. The present method involves consecutive desulphurization and \(C\hbox -}N\) cross-coupling reaction. Cheap, readily available and air stable cobalt catalyst has been used for this methodology. In addition, the substrate scope has been demonstrated. Graphical AbstractA
摘要已经探索了用于芳基四唑胺的区域选择性合成的高度通用,有效和简单的方法。本方法涉及连续的脱硫和\(C \ hbox -} N \)交叉偶联反应。廉价,易于获得且空气稳定的钴催化剂已用于此方法。另外,已经证明了基板范围。 图形概要已经探索了用于芳基四唑胺的区域选择性合成的高度通用,有效和简单的方法。本方法涉及连续的脱硫和\(C \ hbox -} N \)交叉偶联反应。