Naphthyridines. Part 3: First example of the polyfunctionally substituted 1,2,4-triazolo[1,5-g][1,6]naphthyridines ring system
作者:Ramadan Ahmed Mekheimer、Yusria Rizk Ibrahim、Eltaib Ali Ahmed、Wolfgang Frey
DOI:10.1016/j.tet.2009.09.082
日期:2009.11
Treatment of 1,2,4-triazoles (1) with diethylmalonate in bromobenzene gave 1,2,4-triazolo-[1,5-a]pyridines 2. Chlorination of 2 using POCl3/DMF (Vilsmeier reagent) led to the isolation of 7-chloro-6-formyl-1,2,4-triazolo[1,5-a]pyridine derivative 4, which reacted with the stabilized ylid 5 to afford 6-ethoxycarbonylvinyl-1,2,4-triazolo[1,5-a]-pyridines 6. Azidation of 6 yielded the corresponding azido
在溴苯中用丙二酸二乙酯处理1,2,4-三唑(1),得到1,2,4-三唑-[1,5- a ]吡啶2。使用POCl 3 / DMF(Vilsmeier试剂)氯化2导致分离7-氯-6-甲酰基-1,2,4-三唑并[1,5- a ]吡啶衍生物4,该衍生物与稳定的碘5反应 得到6-乙氧基羰基乙烯基-1,2,4-三唑并[1,5- a ]-吡啶6。叠氮化6产生相应的叠氮基化合物7,(方案2)。用Na 2 S 2 O还原74得到相应的7-氨基化合物8,其在沸腾的DMF中环化,得到新的1,2,4-三唑并[1,5- g ] [1,6]萘啶9。另一方面,使7与1当量的PPh 3(氮杂-维蒂希反应)在CH 2 Cl 2中反应,得到7-亚氨基-膦烷衍生物10,随后在沸腾的DMF中环化,得到新的1,2,4-三唑并[ 1,5- g ] [1,6]萘啶衍生物11(方案3)。然而,在回流温度下,在1,2-二氯苯中用异硫氰酸苯酯处理10,得到新的1