Synthesis of Highly Stereodefined Tetrasubstituted Acyclic All-Carbon Olefins via a <i>Syn</i>-Elimination Approach
作者:Ngiap-Kie Lim、Patrick Weiss、Beryl X. Li、Christina H. McCulley、Stephanie R. Hare、Bronwyn L. Bensema、Teresa A. Palazzo、Dean J. Tantillo、Haiming Zhang、Francis Gosselin
DOI:10.1021/acs.orglett.7b03141
日期:2017.11.17
An efficient synthesis of stereodefined tetrasubstituted acyclic all-carbon olefins has been developed via a bis(2,6-xylyl)phosphate formation of stereoenriched tertiary alcohols, followed by in situ syn-elimination of the corresponding phosphates under mild conditions. This chemistry tolerates a wide variety of electronically and sterically diverse substrates and generates the desired tetrasubstituted
通过形成双(2,6-二甲苯基)磷酸形成富含立体异构的叔醇,然后在温和条件下原位合成消除相应的磷酸酯,已经开发出有效合成立体确定的四取代的无环全碳烯烃的方法。在大多数情况下,这种化学方法可耐受多种电子和空间上不同的底物,并以高收率和立体选择性(> 95:5)生成所需的四取代烯烃。该立体控制的烯烃合成已经以三步法从97:3立体选择性和78%的总收率应用到抗癌药他莫昔芬的合成中,该步骤由市售的1,2-二苯基丁烷-1-酮合成。