Preparation of New Nitrogen-Bridged Heterocycles. XXVI. Crystal Structures of Thieno(3,2-a)-and Thieno(2,3-b)indolizine Derivatives.
作者:Akikazu KAKEHI、Suketaka ITO、Tosio SAKURAI、Kunio URUSHIDO
DOI:10.1248/cpb.39.1949
日期:——
Single crystal X-ray analyses of thieno[3, 2-a]- and thieno[2, 3-b]indolizine derivatives were carried out and their structures were definitively established. The tricyclic ring systems in both molecules were nearly planar and their deviations from the least-squares planes were less than 6.26°. The structural factors for their indolizine moieties were very similar to those for known aromatic indolizines, but those for the thiophene rings were somewhat different. The deviation from co-planarity and the deformation of the thiophene ring in thieno[3, 2-a]indolizine were greater than those in thieno[2, 3-b]indolizine.
对噻吩并[3, 2-a]-和噻吩并[2, 3-b]吲嗪衍生物进行了单晶 X 射线分析,并确定了它们的结构。这两种分子中的三环系统几乎都是平面的,它们与最小二乘法平面的偏差小于 6.26°。它们的吲哚嗪分子结构系数与已知芳香族吲哚嗪的结构系数非常相似,但噻吩环的结构系数则有些不同。噻吩并[3, 2-a]吲嗪的共面性偏差和噻吩环的变形都大于噻吩并[2, 3-b]吲嗪。