Anti-oxidant activities of curcumin and related enones
作者:Waylon M. Weber、Lucy A. Hunsaker、Steve F. Abcouwer、Lorraine M. Deck、David L. Vander Jagt
DOI:10.1016/j.bmc.2005.03.035
日期:2005.6
anti-oxidant properties. There are conflicting reports concerning the structural/electronic basis of the anti-oxidant activity of curcumin. Curcumin is a symmetrical diphenolic dienone. A series of enone analogues of curcumin were synthesized that included: (1) curcumin analogues that retained the 7-carbon spacer between the aryl rings; (2) curcumin analogues with a 5-carbon spacer; and (3) curcumin
Formal [4 + 2] Cycloadditions of Anhydrides and α,β-Unsaturated <i>N</i>-Tosyl Ketimines
作者:Noah P. Burlow、Sara Y. Howard、Carla M. Saunders、James C. Fettinger、Dean J. Tantillo、Jared T. Shaw
DOI:10.1021/acs.orglett.8b04091
日期:2019.2.15
ketone-derived imines is reported. Cyclic, enolizable anhydrides undergo a base-promoted conjugate addition reaction with α,β-unsaturated N-tosyl ketimines, followed by an intramolecular acylation to give formal [4 + 2] cycloaddition products. The carboxylic acid-containing products are formed with modest selectivity for the cis-diastereomer and can be fully epimerized to the trans-diastereomer upon esterification
The Surfactant-Promoted Cross-Coupling Reactions of Arylboronic Acids with Carboxylic Anhydrides or Acyl Chlorides in Water
作者:Yuhong Zhang、Bingwei Xin、Kai Cheng
DOI:10.1055/s-2007-983729
日期:2007.7
The palladium(II) chloridecatalyzedcross-coupling of arylboronic acids with carboxylic anhydrides or acylchlorides in water in the presence of various surfactants is described. The inexpensive and industrially widely used sodium dodecyl sulfate (SDS) was found to be a good promoter of the coupling reaction and aryl ketones were obtained in good yields without the use of phosphine ligands. The reactions
描述了在各种表面活性剂存在下在水中氯化钯 (II) 催化的芳基硼酸与羧酸酐或酰氯的交叉偶联。发现廉价且工业上广泛使用的十二烷基硫酸钠(SDS)是偶联反应的良好促进剂,并且在不使用膦配体的情况下以良好的收率获得芳基酮。该反应不受芳基硼酸和羧酸衍生物中存在放电子和吸电子取代基的影响,并且在空气中温和条件下获得了多种芳基酮。
Ag2CO3-catalyzed efficient synthesis of internal or terminal propargylicamines and chalcones via A3-coupling under solvent-free condition
or terminal propargylamines and chalcones via A3-coupling reaction of aldehydes, amines, and alkynes catalyzed by an easily available catalyst Ag2CO3 under solvent-free condition. The reaction proceeded smoothly to deliver various products in good-to-excellent yields with good functional group tolerance. Gram-scale preparation, bioactive molecule synthesis and asymmetric substrates have been demonstrated
几个简单,快速和实用的协议已被开发来合成内部或末端炔丙胺和查耳酮通过甲3 -耦合醛,胺的反应,和炔由容易获得的催化剂催化的Ag 2 CO 3无溶剂条件下进行。反应进行得很顺利,以良好的收率和良好的官能团耐受性提供了各种产品。已经证明了克级制备,生物活性分子合成和不对称底物。此外,已经提出了合成不同产物的合理机制。
Transition-Metal-Free Catalytic Formal Hydroacylation of Terminal Alkynes
Although hydroacylation is a very useful reaction for producing ketonesfromaldehydes with 100% atom efficiency, classical Rh-catalyzed hydroacylation presents several problems, including the need for transition metal catalysts, unwanted decarbonylation of aldehydes, and difficulty in regioselectivity control. However, formal hydroacylation utilizing the nucleophilicity of terminal alkynes can avoid