作者:Daniel B. Moran、George O. Morton、J. Donald Albright                                    
                                    
                                        DOI:10.1002/jhet.5570230422
                                    
                                    
                                        日期:1986.7
                                    
                                    4-triazolo[4,3-a]pyridines were developed. The principal route to the required intermediate 2-chloropyridines was based on rearrangements of mono N-oxides of 2,2′-bipyridine, 2,3′-bipyridine, 3,3′-bipyridine, 2,4′-bipyridine and 4,4′-bipyridine with phosphorus oxychloride. Reaction of 3,3′-bipyridine 1-oxide or 2,2′-bipyridine 1-oxide with phosphorus oxychloride gave mixtures of chloro isomers. Reaction with acetic
                                    开发了合成(
吡啶基)-1,2,4-三唑并[4,3- a ]
吡啶的方法。到所需的中间体2-
氯吡啶的主要途径是基于单重排Ñ -oxides 
2,2'-联吡啶,
2,3'-联吡啶,
3,3'-联吡啶,2,4'-联
吡啶和4, 4'-联
吡啶与三
氯氧化
磷。3,3′-联
吡啶1-氧化物或2,2′-联
吡啶1-氧化物与三
氯氧化
磷反应,得到
氯代异构体的混合物。与
乙酸酐,
3,3'-联吡啶1-氧化物和
2,2'-联吡啶1-氧化物反应,仅得到[
3,3'-联吡啶] -2(1 H)-one和[
2,2'-联吡啶] -6(1 H)-一。