The Pd-catalyzed amination of 2,6-dibromopyridine with various linear polyamines and oxapolyamines was studied. In this way polyazamacrocycles 3 containing one pyridine and one polyamine moiety were synthesized using equimolar amounts of starting compounds. Two alternative approaches were elaborated and compared for synthesis of macrocycles 11 comprising two pyridine and two polyamine fragments: via intermediate formation of Nα,Nω-bis(6-halopyridin-2-yl)polyamines 7, 8 or via 2,6-bis(polyamino)-substituted pyridines 10. A series of N-(6-tert-butoxypyridin-2-yl)-substituted polyamines 12 and Nα,Nωbis(6-tert-butoxypyridin-2-yl)-substituted polyamines 13 were obtained by similar procedures, and the possibilities of N,N-dihetarylation of such compounds using 2-bromopyridine and 2-bromo-6-tert-butoxypyridine were studied. The yields of linear and cyclic products were shown to be strongly dependent on the nature of starting polyamines and of the halogen atom.
研究了Pd催化的2,6-二溴吡啶与各种线性聚胺和氧杂聚胺的胺化反应。通过使用等摩尔的起始化合物合成了含有一个吡啶和一个聚胺基团的聚合物环化合物3。为了合成包含两个吡啶和两个聚胺片段的大环化合物11,制定并比较了两种替代方法:通过中间体形成Nα,Nω-双(6-卤代吡啶-2-基)聚胺7、8或通过2,6-双(聚氨基)-取代吡啶10。通过类似的方法获得了一系列N-(6-叔丁氧基吡啶-2-基)-取代聚胺12和Nα,Nω-双(6-叔丁氧基吡啶-2-基)-取代聚胺13,并研究了使用2-溴吡啶和2-溴-6-叔丁氧基吡啶对这类化合物进行N,N-二芳基化的可能性。线性和环状产物的产率显示出强烈依赖于起始聚胺和卤素原子的性质。