Atropisomers of 1-(Acyl or Aroyl)-2-naphthylindolines. Isolation, X-Ray Crystal Structure and Conformational Analysis
作者:Fumikazu Ito、Tetsuya Moriguchi、Yasuyuki Yoshitake、Masashi Eto、Shoji Yahara、Kazunobu Harano
DOI:10.1248/cpb.51.688
日期:——
A series of pairs of stable diastereomeric atropisomers caused by restricted rotation around the Csp3–Csp2 bond of [2-(2-hydroxynaphthalen-1-yl)-3,3-dimethyl-2,3-dihydroindol-1-yl]-(3- or 4-substituted phenyl)-methanone or [2-(2-hydroxynaphthalen-1-yl)-3,3-dimethyl-2,3-dihydroindol-1-yl]-1-alkanone were isolated. The conformational analyses of the atropisomers were performed based on the X-ray crystallographic and 1H-NMR spectral data. It became clear that rotation about the C2–naphthyl bond is restricted at room temperature, whereas the >NCO–Ar bond rotates freely.
分离出一系列稳定的非对映异构体对旋光异构体,它们是由[2-(2-羟基萘-1-基)-3,3-二甲基-2,3-二氢吲哚-1-基]-(3-或4-取代苯基)-甲酮或[2-(2-羟基萘-1-基)-3,3-二甲基-2,3-二氢吲哚-1-基]-1-烷酮的Csp3-Csp2键的受限旋转引起的。根据X射线晶体学和1H-NMR光谱数据对旋光异构体进行了构象分析。结果表明,室温下C2-萘基键的旋转受到限制,而>NCO-Ar键可以自由旋转。