Unexpected isomerization of new naphth[1,3]oxazino[2,3-a]isoquinolines in solution, studied by dynamic NMR and supported by theoretical DFT computations
作者:István Szatmári、Matthias Heydenreich、Andreas Koch、Ferenc Fülöp、Erich Kleinpeter
DOI:10.1016/j.tet.2013.06.094
日期:2013.9
Through the reactions of 1-aminomethyl-2-naphthol and substituted 1-aminobenzyl-2-naphthols with 3,4-dihydroisoquinoline or 6,7-dimethoxy-3,4-dihydroisoquinoline under microwave conditions, naphth-[1,2-e][1,3]oxazino[2,3-a]-isoquinoline derivatives were prepared in good yields. The latter reaction was extended by using 2-aminoarylmethyl-1-naphthols, leading to isomeric naphth-[2,1-e][1,3]oxazino[2
在微波条件下,通过1-氨基甲基-2-萘酚和取代的1-氨基苄基-2-萘酚与3,4-二氢异喹啉或6,7-二甲氧基-3,4-二氢异喹啉的反应,萘基[[1,2- e]以高收率制备了[] [1,3]恶嗪[2,3- a ]-异喹啉衍生物。后者的反应通过使用2-氨基芳基甲基-1-萘酚来扩展,得到异构的萘基-[2,1- e ] [1,3]恶嗪基[2,3- a ]异喹啉。除了详细的NMR光谱学和理论研究以外,这些新的构象柔性杂环系统还具有立体化学和动力学行为,在溶液中观察到两个非对映异构体之间的意外动力学过程,并通过可变温度进行了研究11 H NMR光谱学和机理已通过理论DFT计算得到证明。