Oxidation of nitrogen heterocycles and heterocyclic N-oxides produced thereby
申请人:SOLVAY INTEROX (Société Anonyme)
公开号:EP0705821A1
公开(公告)日:1996-04-10
A process for the production of aromatic heterocyclic N-oxides by reaction between an aromatic compound comprising a heterocyclic nitrogen atom and hydrogen peroxide in the presence of a manganese porphyrin catalyst is provided. The manganese porphyrin catalyst is substituted by an aromatic group at each meso-position, the aromatic nuclei of the aromatic substituents being substituted by one or more electron-withdrawing groups and/or comprising an aromatic quaternary ammonium heteroatom in the aromatic ring. Preferably, the manganese porphyrin catalyst is manganese tetrakis (2,6-dichlorophenyl) porphyrin chloride, manganese tetrakis (2,6-dichlorophenyl-4-sulphonic acid) porphyrin chloride, manganese tetrakis (4-methylpyridinium) porphyrin chloride, or manganese tetrakis (pentafluorophenyl) porphyrin chloride.
One-Pot Conversion of Allylic Alcohols to α-Methyl Ketones via Iron-Catalyzed Isomerization–Methylation
作者:Daniel E. Latham、Kurt Polidano、Jonathan M. J. Williams、Louis C. Morrill
DOI:10.1021/acs.orglett.9b02900
日期:2019.10.4
A one-pot iron-catalyzed conversion of allylic alcohols to α-methyl ketones has been developed. This isomerization-methylation strategy utilized a (cyclopentadienone)iron(0) carbonyl complex as precatalyst and methanol as the C1 source. A diverse range of allylic alcohols undergoes isomerization-methylation to form α-methyl ketones in good isolated yields (up to 84% isolated yield).
Potassium Base‐Promoted Diastereoselective Synthesis of 1,3‐Diols from Allylic Alcohols and Aldehydes through a Tandem Allylic‐Isomerization/Aldol–Tishchenko Reaction
作者:Masahiro Sai
DOI:10.1002/asia.202101093
日期:2021.12.13
important pharmaceuticals, and thus researchers have sought efficient methods for the synthesis of these compounds for decades. In this paper, we report the potassium base-promoted aldol–Tishchenko reactions of allylicalcohols with aldehydes initiated by allylic isomerization, which enable the diastereoselective synthesis of a variety of 1,3-diols.
作者:Stefania F. Musolino、O. Stephen Ojo、Nicholas J. Westwood、James E. Taylor、Andrew D. Smith
DOI:10.1002/chem.201604788
日期:2016.12.23
The non‐enzymatic acylative kineticresolution of challenging aryl–alkenyl (sp2 vs. sp2) substituted secondaryalcohols is described, with effective enantiodiscrimination achieved using the isothiourea organocatalyst HyperBTM (1 mol %) and isobutyric anhydride. The kineticresolution of a wide range of aryl–alkenyl substituted alcohols has been evaluated, with either electron‐rich or naphthyl aryl
描述了具有挑战性的芳基-烯基(sp 2与 sp 2 )取代的仲醇的非酶酰化动力学拆分,并使用异硫脲有机催化剂 HyperBTM(1 mol%)和异丁酸酐实现了有效的对映区分。已经评估了各种芳基-烯基取代醇的动力学拆分,其中富电子或萘基芳基取代基与未取代的乙烯基取代基相结合,提供了最高的选择性( S =2-1980)。演示了使用该方案对模型芳基-乙烯基(sp 2与 sp 2 )取代的仲醇进行克级(2.5 g)动力学拆分,可获取每种产物对映体的 >1 g 99:1呃。
[(NHC)Au<sup>I</sup>]-Catalyzed Rearrangement of Allylic Acetates
作者:Nicolas Marion、Ronan Gealageas、Steven P. Nolan
DOI:10.1021/ol070843w
日期:2007.7.1
[(NHC)AuCl] complexes (NHC = N-heterocycliccarbene), in conjunction with a silver salt, were found to efficiently catalyze the rearrangement of allylic acetates under both conventional and microwave-assisted heating. The optimization of several reaction parameters (solvent, silver salt, and ligand) as well as a study of the reaction scope are reported. The steric hindrance of the ligand bound to gold was