作者:Ole Winkelmann、Christian Näther、Ulrich Lüning
DOI:10.1002/ejoc.200600843
日期:2007.2
Concave bimacrocyclic imidazolinium ions 8 have been synthesized as precursors for N-heterocyclic carbenes 9 (NHC) in 13 to 29 % overall yields based on 2-nitroresorcinol (1). As bridgeheads, 2,6-bis(ω-alkenyloxy)anilines 3 have been synthesized from 1. Reaction of 3 with oxalyl chloride, reduction to respective diamines 5, and ring closure with triethyl orthoformate gave N,N-diaryl-substituted imidazolinium
凹双大环咪唑啉鎓离子 8 已合成为 N-杂环卡宾 9 (NHC) 的前体,基于 2-硝基间苯二酚 (1),总产率为 13% 至 29%。作为桥头堡,2,6-双(ω-烯氧基)苯胺 3 已由 1 合成。3 与草酰氯反应,还原为相应的二胺 5,并与原甲酸三乙酯合环得到 N,N-二芳基取代的咪唑啉鎓离子6.末端乙烯基通过闭环复分解连接得到双大环咪唑啉鎓离子7,其烯烃官能团被氢化得到饱和双大环8。通过X射线分析阐明了8a的结构。通过用叔丁醇钾去质子化产生相应的 NHC 9,并用 CS2 清除 9 以得到加合物 10。(© Wiley-VCH Verlag GmbH & Co. KGaA,69451 Weinheim,德国,