Stereospecific Allylic Functionalization: The Reactions of Allylboronate Complexes with Electrophiles
作者:Cristina García-Ruiz、Jack L.-Y. Chen、Christopher Sandford、Kathryn Feeney、Paula Lorenzo、Guillaume Berionni、Herbert Mayr、Varinder K. Aggarwal
DOI:10.1021/jacs.7b10240
日期:2017.11.1
and imines (π-electrophiles), but are unreactive toward a range of other electrophiles. By addition of an aryllithium, the corresponding allylboronate complexes display enhanced nucleophilicity, enabling addition to a range of electrophiles (tropylium, benzodithiolylium, activated pyridines, Eschenmoser’s salt, Togni’s reagent, Selectfluor, diisopropyl azodicarboxylate (DIAD), MeSX) in high regio- and
烯丙基硼酸酯易于与羰基和亚胺(π亲电子试剂)反应,但对一系列其他亲电子试剂没有反应性。通过添加芳基锂,相应的烯丙基硼酸酯络合物显示出增强的亲核性,从而能够在高区域和高亲和性中添加到一系列亲电试剂中(托乙鎓,苯并二硫代lyyl,活化的吡啶,Eschenmoser盐,Togni试剂,Selectfluor,偶氮二异丙基二异丙基羧酸盐(DIAD),MeSX)立体声控制。该协议提供了对关键新功能的访问,包括带有诸如氟和三氟甲基基团的四级立体异构中心。经测定,烯丙基硼酸酯络合物的反应性比母体硼酸酯高7至10个数量级。