Smooth monoarylation of two triprotected hydrazine reagents under mild conditions has been accomplished using triarylbismuthanes in the presence of copper acetate and amine to give products 3 and 6 in excellent yield. Arylation on N 2 after selective deprotection of derivatives with alkyl or aryl substituents on N 1, resulting in compounds 8 and 9, is also demonstrated. Furthermore, other products derived from these reagents with free N-alkyl and N-aryl functions undergo the same reaction to give substances such as 10 and 11. As a result, the scope of the original hydrazine reagents has been further extended. A few reference compounds have also been prepared directly from phenylhydrazine.
在温和的条件下,使用三芳基
铋烷在
醋酸铜和胺的存在下完成了两种三保护
肼试剂的平滑单芳基化反应,得到了产率极高的产物 3 和 6。在对 N 1 上带有烷基或芳基取代基的衍
生物进行选择性脱保护后,N 2 上的芳基化反应也得到了化合物 8 和 9。此外,由这些试剂衍生出的具有游离 N-烷基和 N-芳基官能团的其他产物也会发生同样的反应,生成 10 和 11 等物质。因此,原始
肼试剂的应用范围得到了进一步扩展。一些参考化合物也是直接从苯
肼中制备出来的。