New latent metathesis catalysts equipped with exchangeable boronic ester groups on the NHC
作者:Revannath Sutar、Danielle Butilkov、N. Gabriel Lemcoff、Ofer Reany
DOI:10.1080/00958972.2018.1481211
日期:2018.7.3
Abstract Latent metathesis catalysts equipped with boronate esters of diols as exchangeable end-groups on their NHC ligands and an S-chelated ruthenium-benzylidene core were synthesized. The stable S-chelated ruthenium complexes underwent hydrolysis under mild acidic conditions, allowing easy exchange of terminal units by several 1,2- and 1,3-diols, without degrading the central ruthenium benzylidene
摘要 合成了在NHC配体上以二醇硼酸酯作为可交换端基和S-螯合的钌-亚苄基核的潜在复分解催化剂。稳定的 S-螯合钌配合物在温和的酸性条件下进行水解,允许几个 1,2- 和 1,3- 二醇轻松交换末端单元,而不会降解中心的亚苄基钌。使用这种策略,我们还制备了在末端配备二烯丙基底物的复分解催化剂,其显示出对 RCM 反应的浓度依赖性。值得注意的是,较大的树枝状催化剂在更稀的条件下更有效。