Solid-State Photochemistry: Absolute Asymmetric β-Thiolactam Synthesis from Achiral N , N -Dibenzyl-α,β-unsaturated Thioamides
作者:Masami Sakamoto、Masaki Takahashi、Wataru Arai、Takashi Mino、Kentaro Yamaguchi、Shoji Watanabe、Tsutomu Fujita
DOI:10.1016/s0040-4020(00)00501-9
日期:2000.9
Several types of achiral N,N-dibenzyl-α,β-unsaturated thioamides were subjected to X-ray crystallographic analysis, and it was revealed that methylcrotonthioamide and 1-cyclohexenecarbothioamide provided chiral crystals. The absolute configuration determined by anomalous scattering method corresponded to the cotton effect in the solid-state CD spectra. The solid-state photoreaction gave optically active
对几种非手性N,N-二苄基-α,β-不饱和硫代酰胺进行了X射线晶体学分析,结果表明,甲基巴豆硫代酰胺和1-环己烯碳硫代酰胺提供了手性晶体。通过异常散射法确定的绝对构型对应于固态CD光谱中的棉花效应。固态光反应产生光学活性的β-硫代内酰胺。另一方面,E - Z异构化发生在二甲苯硫代酰胺衍生物的光反应中。反应前后的立体化学分配是通过烯基碳夺氢,然后通过两性离子中间体进行环化来合理化的。