Compounds with bridgehead nitrogen. 62—NMR spectra and stereochemistry of perhydropyrido[1,2-c][1,3]thiazepines and related systems
作者:Trevor A. Crabb、Asadollah Fallah
DOI:10.1002/mrc.1260280509
日期:1990.5
Perhydropyrido[1,2‐c][1,3] thiazepine adopts (CDCl3 solution, 25°C) an equilibrium containing > 98% trans‐fused conformer, in contrast to perhydropyrido[1,2‐c][1,3]oxazepine, which adopts a ca. 74% trans‐fused ⇌ 26% O‐inside‐cis‐fused conformational equilibrium. The cis‐(H‐5a, H‐8)‐8‐ethyl‐substituted derivatives of both systems show increased preference for the S/O inside cis conformations. The related
与全氢吡啶并[1,2-c][1,3]相比,全氢吡啶并[1,2-c][1,3] thiazepine采用(CDCl3溶液,25°C)含有> 98%输血构象异构体的平衡奥氮平,采用约。74% 输血 ⇌ 26% O-inside-cis-融合构象平衡。两个系统的顺式-(H-5a, H-8)-8-乙基取代衍生物对顺式构象内的 S/O 显示出更高的偏好。相关的 2-叔丁基全氢吡啶并[1,2-c][1,3]二氮杂主要采用转融合构象。