Pd-Catalyzed Stereospecific Cross-Coupling of Chiral α-Borylalkylcopper Species with Aryl Bromides
作者:Hyesu Lee、Soyeon Lee、Jaesook Yun
DOI:10.1021/acscatal.9b05213
日期:2020.2.7
Stereospecific cross-coupling of chiral α-borylalkylcopper species with aryl bromides has been achieved using a Pd catalyst. The combination of a copper catalyst and chiral NHC ligand was efficient for the generation of enantioenriched secondary α-borylorganocopper species via addition of a Cu–Bpin (= pinacol boronic ester) species to alkenyl boramides. Subsequent stereospecific cross-coupling of such
使用Pd催化剂已经实现了手性α-硼烷基烷基铜物质与芳基溴的立体定向交叉偶联。铜催化剂和手性NHC配体的组合可通过向烯基硼酰胺中添加Cu-Bpin(=频哪醇硼酸酯)物种来高效生成对映体富集的仲α-硼基有机铜物种。此类有机铜亲核试剂与芳基溴化物的随后立体定向交叉偶联成功地使用了钯-XPhos催化剂。使用含有1,8- naphthalenediaminatoboryl 1,2-二取代borylalkenes(Bdan)基团所产生的相应的抗-diborylalkanes作为具有良好的对映选择性了一个单一非对映至96.5:3.5 ER,并且所产生的相应的后续氧化反-1,2-二羟基化合物。