Synthesis of stable tail-to-tail-conjugated primary enamines containing hetarene substituents
作者:Doris Wingbermühle、Christian Sarter、Gerhard Erker
DOI:10.1016/0020-1693(94)03908-9
日期:1994.7
described that allows the preparation of stable conjugated primary enamines containing furyl or pyridyl substituents. In a template reaction (butadiene)zirconocene is 1,4-selectively coupled to two 2-cyanopyridine equivalents to give the nine-membered metallacycle 8b . Subsequent treatment with methanol removes the bent metallocene template and leads to the formation of 1,6-diamino-1,6-bis(2-pyridyl)-1,3,5-hexatriene
摘要描述了一种方法,该方法可以制备含有呋喃基或吡啶基取代基的稳定的共轭伯烯胺。在模板反应中,将(丁二烯)锆茂与两个2-氰基吡啶等价物选择性地偶合1,4-茂铁,得到九元金属环8b。随后用甲醇处理除去弯曲的茂金属模板并导致形成1,6-二氨基-1,6-双(2-吡啶基)-1,3,5-己三烯(9b)。类似地制备1,6-二氨基-1,6-双(2-呋喃基)-1,3,5-己三烯体系(9a)(69%分离)。随后将苄腈加到(丁二烯)ZrCp 2中,再加入2-氰基吡啶或2-氰基呋喃,以良好的收率得到各自的不对称取代的1,6-二氨基己三烯。