Journal of the American Chemical Society 由美国化学会出版。1155 Sixteenth Street NW, Washington, DC 20036 通过抗体催化跨越极端机械障碍:顺式烯烃消除 Benjamin F. Cravatt、Jon A. Ashley、Kim D. Janda、Dale L. Boger 和 Richard A. Lerner J.是。化学 Soc., 1994, 116 (13), 6013-6014 • DOI:10.1021/ja00092a080 2009 年 1 月 15 日从 http://pubs.acs.org 下载
Highly Enantioselective Iridium-Catalyzed Hydrogenation of Conjugated Trisubstituted Enones
作者:Bram B. C. Peters、Jira Jongcharoenkamol、Suppachai Krajangsri、Pher G. Andersson
DOI:10.1021/acs.orglett.0c04012
日期:2021.1.1
Asymmetric hydrogenation of conjugated enones is one of the most efficient and straightforward methods to prepare optically active ketones. In this study, chiral bidentate Ir–N,P complexes were utilized to access these scaffolds for ketones bearing the stereogenic center at both the α- and β-positions. Excellent enantiomeric excesses, of up to 99%, were obtained, accompanied with good to high isolated
Tandem Addition β-Lithiation−Alkylation Sequence on α,β-Unsaturated Aldehydes
作者:Norma Sbarbati Nudelman、Graciela V. García
DOI:10.1021/jo005698d
日期:2001.2.1
isotopic exchange reactions and trapping of two intermediates, provide clues on the several mechanistic steps of this new reaction. Extended studies revealed that beta-alkyl-substituted alpha,beta-unsaturated aldehydes and aliphatic lithium reagents did not afford good yields of the tandem reaction products, while aromatic lithium reagents gave good results. The aggregation features of the aryllithium
Practical metal-free synthesis of chalcone derivatives via a tandem cross-dehydrogenative-coupling/elimination reaction
作者:Yu Wei、Jinghua Tang、Xuefeng Cong、Xiaoming Zeng
DOI:10.1039/c3gc41403e
日期:——
Metal-free synthesis of chalcone derivatives through a tandem cross-dehydrogenative-coupling/eliminationreaction is described. A simple and inexpensive ammonium persulfate salt enables the reaction between ketones and benzylamines to proceed with high stereoselectivity and good functional group compatibility.
The selective reduction of α,β-unsaturatedcarbonyl compounds was achieved to produce saturatedcarbonyl compounds with aqueous HI solution. The introduction of aryl group at α or β position was ef...
用 HI 水溶液选择性还原 α,β-不饱和羰基化合物以制备饱和羰基化合物。在α或β位引入芳基是有效的...
[EN] A METHOD FOR PREPARING SULFUR-CONTAINING COMPOUNDS<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE COMPOSÉS CONTENANT DU SOUFRE
申请人:ROYAL COLLEGE OF SURGEONS IE
公开号:WO2010066450A1
公开(公告)日:2010-06-17
The invention provides a method for preparing sulfur-containing compounds, the method comprising reacting a donor compound comprising at least one sulfur having at least one lone pair of electrons, with an acceptor compound; wherein the reaction occurs in the presence of an amine, optionally an amine catalyst, capable of activating the sulfur having at least one lone pair of electrons; and wherein the reaction occurs via the formation of an transient intermediate species, optionally a transient intermediate species, between the amine, optionally the amine catalyst and the donor compound; and wherein the donor compound is selected from the group consisting of a sulfurous acid, a sulfenic acid and a sulfinic acid or a salt, ester or amide of a sulfurous acid, a sulfenic acid and a sulfinic acid. The invention also provides sulfur-containing compounds of the formula: wherein R is selected from: (a) 1 -(4-Nitro-phenyl)-3-oxo-3-phenyl-propane; (b) 2-(3-Methyl-4-nitro-isoxazol-5-yl)-1 -phenyl-ethane; (c) 1-(4-Methoxy-phenyl)-2-(3-methyl-4-nitro-isoxazol-5-yl)-ethane; (d) 2-(3-Methyl-4-nitro-isoxazol-5-yl)-1-(4-nitro-phenyl)-ethane; (e) 1-(4-Fluoro-phenyl)-2-(3-methyl-4-nitro-isoxazol-5-yl)-ethane; (f) 1 -(4-Chloro-phenyl)-2-(3-methyl-4-nitro-isoxazol-5-yl)-ethane; and (g) 3-Oxo-cyclohexane. Finally, the invention provides use of chiral sulfur-containing compounds obtainable by the above-mentioned method or chiral sulfur-containing compounds as mentioned above for the resolution of racemic mixtures of amines.