Regio- and enantioselective synthesis of allenic esters by samarium(II)-mediated reduction of propargylic compounds through dynamic kinetic protonation
作者:Koichi Mikami、Akihiro Yoshida
DOI:10.1016/s0040-4020(00)01044-9
日期:2001.1
Regioselective synthesis of allenic esters was attained by SmI2-mediated reduction of propargylic phosphates and ethers bearing alkoxycarbonyl groups at the acetylene terminus. Using suitable chiral proton source in this system, highly enantio-enriched allenic ester was obtained through dynamic kinetic resolution by Lewis acidic Sm(III)-mediated enantioselective protonation, even if starting with racemic
通过SmI 2介导的炔丙基磷酸酯和在乙炔末端带有烷氧羰基的醚的还原,可以实现烯丙酸酯的区域选择性合成。在此系统中使用合适的手性质子源,即使通过消旋的炔丙基磷酸酯开始,通过路易斯酸性Sm(III)介导的对映选择性质子化,通过动力学动力学拆分也可以得到高度对映体富集的烯丙酸酯。