作者:Fritz Vögtle、Andreas Ostrowicki、Peter Knops、Peter Fischer、Hans Reuter、Martin Jansen
DOI:10.1039/c39890001757
日期:——
The new medium membered heterocycles (2c–i), additionally strained due to internal substituents, could be obtained after optimization of a simple one-step cyclisation reaction; the barrier of the restricted rotations of the phenyl ring in (2h) and of the t-butyl group in (2i) were measured; the X-ray, NMR, and CD data of the stable enantiomers of (2c–i) are compared with those of the less strained
优化了一个简单的一步环化反应后,即可获得新的中成员杂环(2c - i),该杂环因内部取代基而额外应变。测量(2h)中的苯环和(2i)中的叔丁基的受限旋转的势垒;将(2c – i)稳定对映异构体的X射线,NMR和CD数据与应变较小的母体骨架(2a)的X射线,NMR和CD数据进行了比较。