Nucleophilic Reactions of 5-<i>tert</i>-Butyl-2-methoxy-3<i>H</i>-azepine with Alkoxides and Alkyllithium Reagents
作者:Yasuhiro Kubota、Kyosuke Satake、Ryusuke Ikui、Hideki Okamoto、Masaru Kimura
DOI:10.1246/bcsj.76.805
日期:2003.4
The reaction of 5-tert-butyl-2-methoxy-3H-azepine (2a) with sodium alkoxides gave 2-alkoxy-3H-azepine derivatives 3–6 by nucleophilic transetherification. The treatment of 2a with tert-butyllithium also yielded 2,5-di-tert-butyl-3H-azepine (7); however, the reaction of 2a and methyllithium gave the expected 5-tert-butyl-2-methyl-3H-azepine (8) along with unexpected 5-tert-butyl-2,2-dimethyl-2,3-dihydro-1H-azepine
5-叔丁基-2-甲氧基-3H-氮杂 (2a) 与醇钠反应通过亲核转醚反应得到 2-烷氧基-3H-氮杂衍生物 3-6。用叔丁基锂处理 2a 也产生了 2,5-二叔丁基-3H-氮杂 (7);然而,2a 和甲基锂的反应得到了预期的 5-叔丁基-2-甲基-3H-氮杂 (8) 以及意想不到的 5-叔丁基-2,2-二甲基-2,3-二氢-1H- azepine (9),还有 5,5'-di(tert-butyl)-2,2'-methylenedi(3H-azepine) (11),发现其结构是互变异构的 5-tert-butyl-2 -(5-叔丁基-2,3-二氢-1H-氮杂-2-亚基甲基)-3H-氮杂 (12)。基于 ab initio DFT 计算和动力学测量讨论了观察到的互变异构的能量分布。