Cyclization of Electron-Deficient Cyclopentadienone with 2-Alkenyl and 2-Alkynylamines via Sequential Pericyclic Reaction Pathway
作者:Yasuyuki Yoshitake、Kouki Yamaguchi、Chika Kai、Takayo Akiyama、Chiaki Handa、Tamaki Jikyo、Kazunobu Harano
DOI:10.1021/jo015941o
日期:2001.12.1
compounds. The tetracyclic compounds 3 were formed from the intramolecular [4+2]pi cycloadditions of the [1,5]-sigmatropic rearrangement products of the 1,4 adducts of 1a and 2, followed by the [1,5]-sigmatropic rearrangement of hydrogen and dehydrogenation. The bicyclic compounds 5 were derived from the [2pi+2pi+2sigma] reaction of the 1,4 adducts of 1a and 2. The one-pot multistage sequential pericyclic
研究了2,5-双(甲氧基羰基)-3,4-二苯基环戊二烯酮(1a)与烯丙基胺和炔丙基胺的周环反应。根据胺的结构,反应通过首先形成1,4加合物,然后进行烯环化和/或顺序的环周反应而进行。1a与二烯丙基胺(2a)反应,得到四环化合物(3a)。另一方面,1a与2-丙炔基胺(2c)的反应仅得到双环化合物(5c)。在与仲2-丙炔基胺(2d,e)的反应中,仅形成四环化合物(3d,e)。1a与α-支化的1,1-二烷基-2-丙炔基伯胺(2f,g)的反应生成了3型和5型化合物的混合物。四环化合物3是由1a和2的1,4加成物的[1,5]-σ重排产物的分子内[4 + 2] pi环加成形成的,然后是1a和2的[1,5]-σ重排。氢和脱氢。双环化合物5源自1a和2的1,4加合物的[2pi + 2pi + 2sigma]反应。基于X射线晶体学结构和MO讨论了一锅多级连续环周反应计算数据。