Cu-Catalyzed Enantioselective Boron Addition to <i>N</i>-Heteroaryl-Substituted Alkenes
作者:Lu Wen、Zhenting Yue、Haiyan Zhang、Qinglei Chong、Fanke Meng
DOI:10.1021/acs.orglett.7b03327
日期:2017.12.15
moiety are afforded in up to 97% yield and 99:1 enantiomeric ratio. The highly versatile C–B(pin) bond can be converted to a range of useful functional groups, delivering a variety of enantiomerically enriched building blocks that are otherwise difficult to access. The utility of this method is further demonstrated by application to a fragment synthesis of biologically active molecule U-75302. Preliminary
提出了向N-杂芳基取代的烯烃中催化对映选择性Cu-B(pin)(pin =松果醇)的作用,然后由膦-Cu配合物促进了质子化。得到的含有N-杂芳基部分的烷基硼产物以高达97%的收率和99∶1的对映体比例提供。高度通用的C–B(pin)键可以转化为一系列有用的官能团,从而提供了各种对映异构体丰富的结构单元,而这些结构单元否则很难获得。通过应用于生物活性分子U-75302的片段合成进一步证明了该方法的实用性。初步的机理研究表明,杂环的相邻N原子在高反应性和对映选择性方面起着独特的作用。