The asymmetric transferhydrogenation of ketones using isopropyl alcohol (IPA) as hydrogen donor in the presence of novel manganese catalysts is explored. The selective and active systems are easily generated in situ from [MnBr(CO)5] and inexpensive C 2-symmeric bisoxalamide ligands. Under the optimized reaction conditions, the Mn-derived catalyst gave higher enantioselectivity compared with the related
探索了在新型锰催化剂存在下使用异丙醇 (IPA) 作为氢供体的酮的不对称转移氢化。选择性和活性系统很容易由 [MnBr(CO)5] 和廉价的 C 2 对称双草酰胺配体原位生成。在优化的反应条件下,Mn 衍生的催化剂与相关的钌催化剂相比具有更高的对映选择性。
The design and synthesis of novel IBiox N-heterocyclic carbeneligands derived from substituted amino-indanols
作者:Jean-Noël Levy、Christopher M. Latham、Loïc Roisin、Nadine Kandziora、Paolo Di Fruscia、Andrew J. P. White、Simon Woodward、Matthew J. Fuchter
DOI:10.1039/c1ob06780j
日期:——
(NHC) ligands has been developed. The resulting ligands have restricted flexibility and high steric demand. Preliminary studies have shown these ligands to give high levels of asymmetricinduction in the copper-free allylicalkylation of cinnamyl bromide.