Synthesis of Racemic, Diastereopure, and Enantiopure Carba- or Oxa[5]-, [6]-, [7]-, and -[19]helicene (Di)thiol Derivatives
作者:Jindřich Nejedlý、Michal Šámal、Jiří Rybáček、Isabel Gay Sánchez、Václav Houska、Tomáš Warzecha、Jaroslav Vacek、Ladislav Sieger、Miloš Buděšínský、Lucie Bednárová、Pavel Fiedler、Ivana Císařová、Ivo Starý、Irena G. Stará
DOI:10.1021/acs.joc.9b02965
日期:2020.1.3
A series of carba- or oxa[5]-, [6]-, [7]-, and -[19]helicene (di)thiols was prepared. The Miyazaki-Newman-Kwart rearrangement of (dimethylcarbamothioyl)oxy (oxa)helicenes in a flow reactor or nucleophilic substitution of dichloro (oxa)helicenes with alkanethiolates were used in the sulfanylation step. Despite the high temperatures employed in this key step, no conformational scrambling was observed
制备了一系列的羰基-或氧杂[5]-,[6]-,[7]-和-[19] hel烯(二)硫醇。在磺酰化步骤中使用流动反应器中的(二甲基氨基甲硫酰基)氧基(氧杂)螺旋烯的宫崎-纽曼-科沃特重排或用链烷硫醇盐对二氯(氧杂)螺旋烯的亲核取代。尽管在此关键步骤中使用了高温,但在非对映体和对映体纯草并茂的不对称合成过程中,未观察到构象加扰。最长的氧杂[19]螺旋二硫醇衍生物的单分子电导率通过扫描隧道显微镜断裂连接方法进行了研究。