Weygand; Mensdorf, Chemische Berichte, 1935, vol. 68, p. 1825,1832
作者:Weygand、Mensdorf
DOI:——
日期:——
Continuous-flow hydration–condensation reaction: Synthesis of α,β-unsaturated ketones from alkynes and aldehydes by using a heterogeneous solid acid catalyst
A simple, practical and efficient continuous-flow hydration-condensation protocol was developed for the synthesis of alpha,beta-unsaturated ketones starting from alkynes and aldehydes by employing a heterogeneouscatalyst in a flow microwave. The procedure presents a straightforward and convenient access to valuable differently substituted chalcones and can be applied on multigram scale.
Asymmetric Epoxidation of Unsaturated Ketones Catalyzed by Heterobimetallic Rare Earth–Lithium Complexes Bearing Phenoxy-Functionalized Chiral Diphenylprolinolate Ligand
作者:Qinqin Qian、Yufang Tan、Bei Zhao、Tao Feng、Qi Shen、Yingming Yao
DOI:10.1021/ol5020398
日期:2014.9.5
Four novel heterobimetalliccomplexes [REL2][(THF)3Li]2(μ-Cl)} stabilized by chiral phenoxy-functionalized prolinolate (RE = Yb (1), Y (2), Sm (3), Nd (4), H2L = (S)-2,4-di-tert-butyl-6-[[2-(hydroxydiphenylmethyl)pyrrolidin-1-yl]methyl]phenol have been synthesized and characterized. These readily available complexes are highly active in catalyzing the epoxidation of α,β-unsaturated ketones, while
四种新型双核配合物[REL 2 ] [(THF)3李] 2(μ-Cl)的}通过手性苯氧基官能化prolinolate稳定(RE =镱(1),Y(2),SM(3),钕(4),H 2 L =(小号)-2,4-二-叔已经合成并表征了丁基-6-[[[2-(羟基二苯基甲基)吡咯烷-1-基]甲基]苯酚。这些容易获得的络合物在催化α,β-不饱和酮的环氧化中具有高活性,而对映选择性根据稀土中心的离子半径而变化。在10 mol%的1存在下,使用TBHP作为氧化剂,在0°C于80→99%ee下,将一系列查尔酮衍生物转化为手性环氧化物。