Photochemical<i>EZ</i>-Isomerization of<i>α</i>,<i>β</i>-Unsaturated Amides and Thioamides in the Solid State
作者:Kazushi Kinbara、Kazuhiko Saigo
DOI:10.1246/bcsj.69.779
日期:1996.3
β-unsaturated amides, which had low isomerizability in the solid state, was greatly improved by modifying their structure; EZ-isomerizability was attained by replacing the carbonyl group of the amides by a thiocarbonyl group as well as replacing the heterochiral N-substituent of the amides by a homochiral one. Crystallographic analyses have revealed that the isomerizability of α,β-unsaturated amides and thioamides
α,β-不饱和酰胺在固态时的异构化能力较低,通过对其结构进行修饰,其固态EZ异构化能力得到了极大的提高;EZ-异构化是通过用硫代羰基取代酰胺的羰基以及用同手性取代酰胺的杂手性N-取代基来实现的。晶体学分析表明,固态的 α,β-不饱和酰胺和硫代酰胺的异构化部分取决于它们在晶体中的分子构象。此外,发现填充系数与异构化能力相关;较小的填充系数值会导致 (Z)-异构体的形成增加。