Chiral cruciferous phytoalexins: Preparation, absolute configuration, and biological activity
作者:Kenji Monde、Tohru Taniguchi、Nobuaki Miura、Peter Kutschy、Zuzana Čurillová、Martina Pilátová、Ján Mojžiš
DOI:10.1016/j.bmc.2005.06.001
日期:2005.9
corresponding racemates. The absolute configuration of natural (+)-2 was elucidated as R by using the direct comparison of ECD and VCD spectra with those of known (S)-(-)-spirobrassinin (1). Another chiral phytoalexin, (-)-4a, had its absolute configuration 2R,3R elucidated through the comparison of observed and calculated VCD. Interestingly, the absolute configurations of natural (S)-(-)-spirobrassinin
通过有效的一锅螺环化方法合成了两种手性十字花科植物抗毒素,分别是1-消旋螺芥蓝素(2)和1-甲氧基螺芥蓝甲醚(4a),通过旋光拆分,使用了相应外消旋体的手性HPLC方法制备的。通过直接比较ECD和VCD光谱与已知(S)-(-)-spirobrassinin(1)的光谱,将天然(+)-2的绝对构型阐明为R。另一种手性植物抗毒素(-)-4a通过比较观察到的和计算出的VCD阐明了其绝对构型2R,3R。有趣的是,天然(S)-(-)-spirobrassinin(1)和(R)-(+)-1-甲氧基spirobrassinin(2)的绝对构型彼此相反,即使它们的结构几乎相似, N-甲氧基除外。