4) and 10,11-dihydro-8H,15bH-naphth[2,1-e][1,3]oxazino[4,3-a]isoquinolines (15 and 16) were prepared. Conformational analysis of both the piperidine and the 1,3-oxazine moieties of these heterocycles by NMR spectroscopy and an accompanying theoretical study revealed that these two conformationally flexible six-membered ring moieties prefer twisted chair conformers.
通过将1-(β-羟基
萘基)-1,2,3,4-
四氢异喹啉和1-(α-羟基
萘基)-1,2,3,4-
四氢异喹啉与
甲醛,
光气,
对硝基苯甲醛或对-环化
氯苯基异
硫氰酸酯,8-取代的10,11-dihydro-8 H,15b H-
萘[1,2- e ] [1,3]恶嗪基[4,3- a ]
异喹啉(3和4)和10,11-二氢-8 H,15b H-
萘[2,1- e ] [1,3]恶嗪基[4,3- a ]
异喹啉(15和16)已准备好。通过NMR光谱对这些杂环的
哌啶和1,3-恶嗪部分进行构象分析,并进行了理论研究,结果表明,这两个构象上灵活的六元环部分更喜欢使用扭曲的椅子构象异构体。