Regioselective coupling reactions of 2,4-diaminopyridine derivatives with aryl halides: the synthesis of elaborated pyridines
作者:Matthew M. Bio、Ed Cleator、Antony J. Davies、Simon E. Hamilton、Andrew Lawrence、Faye J. Sheen、Gavin W. Stewart、Robert D. Wilson
DOI:10.1016/j.tet.2009.08.056
日期:2009.10
The development of a synthetically useful, regioselective cross-coupling of 2,4-diaminopyridines with aryl and heteroaryl halides is reported. Selectivity for coupling through either amine is controlled by a simple change in the reaction conditions. Cross-coupling through the 2-amino group predominates in the presence of a palladium catalyst, whilst the 4-amino coupled product predominates in the absence
据报导了2,4-二氨基吡啶与芳基和杂芳基卤化物的合成上有用的区域选择性交叉偶联的发展。通过任一种胺偶联的选择性通过反应条件的简单改变来控制。在钯催化剂的存在下,通过2-氨基的交叉偶联反应占主导,而在没有钯的情况下,通过4-氨基偶联的产物占主导。