A synthesis of dialkyl (12E,14E)-7-oxo-10,11-dihydro-7H,9H-azocino[2,1-a]benzo[de]isoquinoline-13,14-dicarboxylates through a 1,3-dipolar cycloaddition reaction of azomethine ylides, generated in situ from proline and acenaphthylene-1,2-dione, with dialkyl acetylenedicarboxylates is described. According to the X-ray diffraction data, the tetrahydroazocine ring has a rigid twist-boat form with approximate local C2 symmetry.

中文翻译：

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从 Acenaphthylene-1,2-dione、Proline 和 Acetylenic 酯方便地合成稠合四氢偶氮化合物

二烷基 (12E,14E)-7-oxo-10,11-dihydro-7H,9H-azocino[2,1-a]benzo[de]isoquinoline-13,14-dicarboxylates 通过 1,3-dipolar描述了由脯氨酸和苊-1,2-二酮原位生成的偶氮甲碱叶立德与乙炔二羧酸二烷基酯的环加成反应。根据 X 射线衍射数据，四氢阿佐辛环具有刚性扭曲船形，具有近似的局部 C2 对称性。