Desulfurization Strategy in the Construction of Azoles Possessing Additional Nitrogen, Oxygen or Sulfur using a Copper(I) Catalyst
作者:Srimanta Guin、Saroj Kumar Rout、Anupal Gogoi、Shyamapada Nandi、Krishna Kanta Ghara、Bhisma K. Patel
DOI:10.1002/adsc.201200408
日期:2012.10.8
A tandem and convergent approach to various N-, O-, or S-containing azoles has been developed by exploiting the thiophilic property of copper(I) iodide used in a catalytic quantity. The present protocol gives access to amino-substituted tetrazoles, triazoles, oxadiazoles and thiadiazoles via oxidative desulfurization of their respective precursors followed by inter- or intramolecular attack of suitable
通过利用催化量使用的碘化亚铜(I)的亲硫特性,已经开发出一种串联和收敛的方法,用于处理各种含N,O或S的唑。本方案通过其各自前体的氧化脱硫,然后通过分子间或分子内攻击合适的亲核试剂,来获得氨基取代的四唑,三唑,恶二唑和噻二唑。对于氨基四唑和三唑,可通过适当调节pK a获得出色的区域选择性与不对称硫脲连接的母体胺的分子量 该方法代表了一种自动催化过程,其中碘化铜(I)被转化为硫化铜(II),硫化铜又转化为活性的氧化铜(II),有效地推进了催化循环。还使用扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)分析研究了铜催化剂的命运,从而深入了解了该催化过程的机理。