by spectral data [Mass, 1H & 13C NMR, NOE and HETERO COSY]. Structure 5 has been confirmed by X-ray crystal structure analysis. Reaction of 1a–f, similarly, gave the corresponding compounds 2a–f, 5a–f and 8a–f. The starting tetrahydroisoquinolines, 1a–f were synthesised by the reaction of the corresponding β-keto esters with cyanoacetamide. Reaction of 8 with POCl3 gave in almost quantitative yield
4-
氰基-1,3-二羟基-5,6-7,8-
四氢异喹啉1与Vilsmeier试剂反应生成
氯醛2,二
氯[2,7]
萘啶5和一
氯[2,7]
萘啶8由光谱数据[质量,1 H和13 C NMR,NOE和杂多态]确定。通过X射线晶体结构分析已经确认了结构5。同样,1a–f的反应给出了相应的化合物2a–f,5a–f和8a–f。起始的
四氢异喹啉1a-f是通过相应的β-
酮酯与
氰基乙酰胺反应合成的。8与POCl 3的反应几乎定量给出了二
氯化合物5。已经提出了可接受的机制用于产物的形成。