New findings in Bischler-Napieralski reaction: Formation of 12-azonianaphth[1. 2-b]azulenes from 2-aryl-1-naphthylformamides and their unexpected transformation into benz[g]indoles through hydride reduction
作者:Tsutomu Ishikawa、Tatsuru Saito、Shigeru Noguchi、Hisashi Ishii、Shuichiro Ito、Tadashi Hata
DOI:10.1016/0040-4039(95)00399-w
日期:1995.4
The Bischler-NapieralskiReaction (BNR) of N-[2-(2-alkoxy-4, 5-methylenedioxyphenyl)-1-naphthyl]-N-methylformamides using POCl3 abnormally gave 12-azonianaphth[1. 2-b]azulene derivatives, which could be effectively transformed into benz[g]indoles with a 1-alkoxy-8-oxabicyclo[3. 2. 1]oct-2-ene skeleton through hydride reduction, as additional cyclized products. In contrast, the BNR of naphthylformamides
使用POCl 3的N- [2-(2-烷氧基-4,5-亚甲基二氧苯基)-1-萘基] -N-甲基甲酰胺的Bischler-Napieralski反应(BNR)异常生成12-氮杂萘并[1]。2- b ] azulene衍生物,可以有效地转化为带有1-烷氧基-8-氧杂双环[3]的苯并[ g ]吲哚。2. 1]通过氢化物还原的辛-2-烯骨架,作为另外的环化产物。相反,在苯环的相同位置具有甲氧基取代亚甲二氧基官能团的萘甲酰胺的BNR导致正常环化,定量得到苯并[ c ]菲啶鎓氯化物。将讨论异常BNR和吲哚形成的推测机制。