Synthesis of Hydrazines with Aromatic Substituents Using Triarylbismuth Reagents
作者:Olavi Loog、Uno Mäeorg、Ulf Ragnarsson
DOI:10.1055/s-2000-7600
日期:——
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.