Asymmetric synthesis of cyclopropyl phosphonates using chiral terpenyl sulfonium and selenonium ylides
作者:Wanda H. Midura、Jacek Ścianowski、Anna Banach、Adrian Zając
DOI:10.1016/j.tetasy.2014.10.002
日期:2014.11
The asymmetric cyclopropanation of a vinylphosphonate using optically active sulfonium and selenonium ylides derived from (−)-menthol and (+)-limonene was developed. The ylides were generated in situ by the reaction of the corresponding sulfonium or selenonium salt in the presence of potassium carbonate or DBU as a base. The transfer of the CHPh and CHCO2Et groups into the cyclopropane ring showed
使用衍生自光学活性锍和硒鎓叶立德一个乙烯基膦的不对称环丙烷( - ) -薄荷醇和(+) -苎烯的开发。由相应的锍或硒鎓盐在碳酸钾或DBU存在作为碱的反应在原位产生的内鎓盐。所述CHPh配合和CHCO的转移2的Et基团引入到环丙烷环呈中度非对映选择性和对映选择性优良(高达99:1)的反式-和CIS -products。苯基环丙基的绝对构型是基于相比于它们的甲苯基类似物分配。