Synthesis and characterization of 2H-, 3H- and 4H-azepine: the first observation of the thermal distribution equilibrium of azepines
作者:Kyosuke Satake、Ryoichi Okuda、Michiaki Hashimoto、Yasushi Fujiwara、Izumi Watadani、Hideki Okamoto、Masaru Kimura、Shiro Morosawa
DOI:10.1039/c39910001154
日期:——
Demethoxycarbonylation of methyl 2,5,-di-tert-butyl-1H-azepine-1-carboxylate using 1,8-diazabicyclo[5.4.0]undec-7-ene gives exclusively two isomers of 3H-azepine derivatives, while methyl 3,6-di-tert-butyl-1H-azepine-1-carboxylate gives a mixture of 2H-, 3H- and 4H-azepine derivatives under the same conditions because of a 1,5-hydrogen shift in the resulting triene system.
1,8-二氮杂双环[5.4.0]十一碳-7-烯对2,5,-二叔丁基-1 H-氮杂-1-羧酸甲酯的脱甲氧基羰基化反应仅产生3个H-氮杂衍生物的两种异构体,而3,6-二叔丁基-1 H-氮杂-1-甲酸甲酯在相同条件下会产生2 H-,3 H-和4 H-氮杂衍生物的混合物,因为其中有1,5-氢转移生成的三烯系统。