Asymmetric Hydrocyanation of α,β-Unsaturated Ketones into β-Cyano Ketones with the [Ru(phgly)<sub>2</sub>(binap)]/C<sub>6</sub>H<sub>5</sub>OLi Catalyst System
作者:Nobuhito Kurono、Noriyuki Nii、Yusuke Sakaguchi、Masato Uemura、Takeshi Ohkuma
DOI:10.1002/anie.201100939
日期:2011.6.6
Enantioselective conjugate addition of HCN to α,β‐unsaturated ketones catalyzed by the combined system of [Ru(S)‐phgly}2(S)‐binap}] and C6H5OLi has afforded β‐cyano ketones in high yield (see scheme). No detectable amount of the corresponding 1,2‐adduct was produced and tert‐C4H9OCH3 was the solvent of choice. The cyanation was conducted with a substrate‐to‐catalyst molar ratio in the range of 200:1–1000:1
通过[Ru (S)-phgly} 2 (S)-binap}]和C 6 H 5 OLi的联合体系催化,HCN向α,β-不饱和酮的对映选择性共轭加成反应提供了高浓度的β-氰基酮产量(请参阅计划)。没有产生可检测量的相应的1,2-加合物,叔C 4 H 9 OCH 3是选择的溶剂。在-20-0°C下,氰化反应以底物与催化剂的摩尔比在200:1-1000:1的范围内进行。