Naphthalene- and Anthracene-Based Aromatic Foldamers with Iminodicarbonyl Linkers: Their Stabilities and Application to a Chiral Photochromic System Using Retro [4 + 4] Cycloaddition
作者:Hyuma Masu、Ikuko Mizutani、Takako Kato、Isao Azumaya、Kentaro Yamaguchi、Keiki Kishikawa、Shigeo Kohmoto
DOI:10.1021/jo0611317
日期:2006.10.1
folding remained for a reasonably long time without racemization in solution. Racemization due to conformational equilibration occurred very slowly, requiring over 1 week at ambient temperature. Their CD spectra both in solution and in the solid state gave similar CD signals, suggesting retention of helicity observed in the solid state even after dissolving. As an application of this novel chiral folding
圆二色性(CD)光谱研究具有大的N取代基的蒽和萘部分的手性芳族链酰亚胺显示,基于折叠的螺旋手性在溶液中不消旋地保留了相当长的时间。由于构象平衡而引起的外消旋作用非常缓慢,在环境温度下需要超过1周的时间。它们在溶液和固态中的CD光谱都给出相似的CD信号,这表明即使在溶解后,在固态中观察到的螺旋度也得以保留。作为这种新型芳香族酰亚胺手性折叠的应用,基于蒽-萘系统的光[4 + 4]环加成及其热环还原,研究了一种手性光致变色系统。为此,制备了具有在中心具有蒽部分的折叠剂,该折叠剂通过亚氨基二羰基连接体在其下方和上方与两个萘部分连接。观察到CD的折叠剂的诱导CD。酰亚胺氮原子上的(S) -1-(1-萘基)乙基取代基。通过CD光谱测量监测手性光致变色循环。