4-b]isoquinoline (11), which are the first representatives of these ring systems. NMR spectroscopic analysis revealed the existence of conformational equilibria that are fast on the NMR timescale. Theoretical DFT calculations pointed to the participation of generally two preferred conformers in the conformational equilibria; the positions of the equilibria were indicated by the experimental NMR spectroscopic
利用
四氢异喹啉1,2-
氨基醇与
苯基膦酰二
氯、双(2-
氯乙基)二
氯亚
磷酰胺、亚
硫酰氯和
磺酰氯的环化反应合成1,5,6,10b-四氢-1,3,2-氧氮杂
磷[ 4,3-a]
异喹啉 (2, 3), 1,5,10,10a-四氢-1,3,2-oxazaphospholo[3,4-b]isoquinolines (8, 9), 1,5,6, 10b-四氢-1,2,3-oxathiazolo[4,3-a]isoquinolines (4–6) anda 1,5,10,10a-tetrahydro-1,2,3-oxathiazolo[3,4-b]isoquinoline (11),这是这些环系统的第一个代表。核磁共振光谱分析揭示了在核磁共振时间尺度上快速的构象平衡的存在。理论 DFT 计算表明通常有两个优选的构象异构体参与构象平衡;平衡的位置由实验核磁共振光谱参数指示,它们与参与构象异构体的理论计算能量差异非常吻合。对于无法分离的两种化合物