Practical Method for the Rhodium-Catalyzed Addition of Aryl- and Alkenylboronic Acids to Aldehydes
作者:Alois Fürstner、Helga Krause
DOI:10.1002/1615-4169(20010430)343:4<343::aid-adsc343>3.0.co;2-z
日期:2001.4.30
The arylation or alkenylation of aldehydes with boronic acids is conveniently effected by a catalyst system comprising RhCl3⋅3 H2O (1 mol %), the sterically hindered imidazolium salt 2 (1 mol %), and a base. The N-heterocyclic carbene 6 derived from 2 is believed to be the actual ligand to the catalytically active rhodium species formed in situ. The method is compatible with various functional groups
芳基化或与硼酸醛的烯基化可方便地通过包含的RhCl的催化剂体系进行3 ⋅3ħ 2 O(1摩尔%),空间位阻的咪唑鎓盐2(1摩尔%),和碱。据信源自2的N-杂环卡宾6是原位形成的催化活性铑物种的实际配体。该方法与两个反应伙伴中的各种官能团均相容,并且除了Garner醛23之外,还遵循非螯合受控途径。