Induced circular dichroism in chiral N-methyl amides possessing an achiral binaphthyl chromophore and its application to absolute configuration determination of aliphatic chiral amines
作者:Toshio Fujiwara、Yuka Taniguchi、Yukiteru Katsumoto、Takeyuki Tanaka、Manabu Node、Minoru Ozeki、Masayuki Yamashita、Shinzo Hosoi
DOI:10.1016/j.tetasy.2012.06.013
日期:2012.7
Induced circular dichroism (ICD) was observed in binaphthyl N-methyl amides of chiral primary amines. The CD spectra showed split curves centered at 225 nm. A good correlation was found between the sign of the exciton chirality of the binaphthyl derivative and the absolute configuration of the original amine. Furthermore, the screw sense of the two naphthyl groups in the most stable conformer obtained
在手性伯胺的联萘基N-甲基酰胺中观察到诱导的圆二色性(ICD)。CD光谱显示出以225nm为中心的分裂曲线。在联萘衍生物的激子手性征与原始胺的绝对构型之间发现良好的相关性。此外,通过分子力学(MM)计算获得的最稳定构象异构体中两个萘基的螺丝感与激子手性所预期的一致,这表明基于MM计算的方法可用于确定未知的绝对构型脂族手性胺。通过测定天然产物d-和l-环丝氨酸的绝对构型证明了本方法的实际应用。