Design of optically active selenium reagents having a chiral tertiary amino group and their application to asymmetric inter- and intramolecular oxyselenenylations
作者:Ken-ichi Fujita、Kazuhisa Murata、Michio Iwaoka、Shuji Tomoda
DOI:10.1016/s0040-4020(96)01166-0
日期:1997.2
class of chiral selenium reagents 4–7 was synthesized on the basis of the concept that the strong intramolecular interaction between an electrophilic selenium and an optically modified tertiary amine (Se…N interaction) would induce asymmetric induction in the reaction between the selenium reagent and olefins. When 7, which showed the most powerful asymmetric induction, was applied to asymmetric methoxyselenenylation
基于这样的概念,合成了一类新的手性硒试剂4-7:亲电硒与光学修饰的叔胺之间的强分子内相互作用(Se…N相互作用)会在硒试剂之间的反应中诱导不对称诱导和烯烃。当在最适反应条件下将表现出最强不对称诱导作用的7应用于(E)-苯基丙烯的不对称甲氧基硒基化反应时,反式最高的非对映异构体过量(de)获得了另外的产物(97%de)。在各种烯烃的不对称甲氧基硒烯化反应中(高达97%de),末端烯烃(不超过59%de的不对称分子)和内烯烃的不对称分子内氧硒烯化(不超过98%的de)也采用了相同的反应条件。结果表明,这类具有强Se…N相互作用的硒试剂可用于不对称有机合成。