Salicylic Acid‐Catalyzed Arylation of Enol Acetates with Anilines
作者:Diego Felipe‐Blanco、Jose C. Gonzalez‐Gomez
DOI:10.1002/adsc.201800427
日期:2018.7.16
α‐Arylketones are both structure moieties commonly found in bioactive compounds and versatile synthetic intermediates for the preparation of drug‐like molecules. An operationally simple and scalable protocol has been developed to prepare α‐arylketonesfrom readily available aromatic amines and enolacetates (or silyl enol ethers). This metal‐free methodology features the use of salicylic acid as
diastereo- and enantioselectiveN-heterocyclic carbene-catalyzed cascade annulation reactions using benzodiketones and enals under oxidative conditions, which afford a variety of 1,2-dihydronaphthalenes with two adjacent stereocenters in up to 99% yield, with >20:1 dr, and up to 99% ee, are reported. Furthermore, the product can be easily transformed to a series of useful compounds such as alcohol, amide,
2,3-Benzodiazepines were synthesized by two-step or one-pot reactions from aryne precursors. Reaction of 2-(trimethylsilyl)aryl triflates with β-diketones in the presence of CsF gave ortho-substitu...
Tandem carbon–carbon bond insertion and intramolecular aldol reaction of benzyne with aroylacetones: novel formation of 4,4′-disubstituted 1,1′-binaphthols
An efficient route to 4-aryl-2-naphthols from arynes and aroylacetones was developed by carbon-carbon bond insertion followed by an intramolecular aldol reaction and dehydration. Benzyne derived from 2-(trimethylsilyl)phenyl triflate reacted with benzoylacetones in refluxing acetonitrile to give 4-aryl-2-naphthols and 3-aryl-1-naphthols.
Yanovsky reaction of η<sup>6</sup>-arene-η<sup>5</sup>-cyclopentadienyliron cations with carbanions derived from ketones. Regiospecific attack ortho to electron withdrawing functions
作者:Ronald G. Sutherland、Ratan L. Chowdhury、Adam Piórko、Choi Chuck Lee
DOI:10.1039/c39850001296
日期:——
η6-Arene-η5-cyclopentadienyliron salts containing electronwithdrawing groups such as nitro, halogeno, benzoyl, cyano, and sulphonyl on the arene ring react with carbanions to give eletroneutral adducts of the Yanovsky type; these adducts give the corresponding substituted benzene on treatment with buffered cerium(IV) ammonium nitrate.
η 6 -Arene-η 5成含有吸电子基团如硝基,卤素,苯甲酰基,氰基和磺酰基的芳烃环上-cyclopentadienyliron盐反应与负碳离子,得到Yanovsky类型的eletroneutral加合物; 这些加合物在用硝酸铈(IV)铵缓冲液处理后得到相应的取代苯。