Stereoselective Synthesis of Diverse Lactones through a Cascade Reaction of Rhodium Carbenoids with Ketoacids
作者:Nicholas P. Massaro、Joseph C. Stevens、Aayushi Chatterji、Indrajeet Sharma
DOI:10.1021/acs.orglett.8b03327
日期:2018.12.7
A convergent cascade approach for the stereoselectivesynthesis of diverse lactones is described. The Rh2(TFA)4-catalyzed cascade reaction proceeds via a carboxylic acid O–H insertion/aldol cyclization with high chemo-, regio-, and diastereoselectivity. The cascade reaction provides quick access to highly functionalized γ-butyro- and δ-valerolactones from readily accessible ketoacid and diazo synthons
Preparation of 2-Pyridone-Containing Tricyclic Alkaloid Derivatives as Potential Inhibitors of Tumor Cell Proliferation by Regioselective Intramolecular N- and C-Acylation of 2-Pyridone
作者:Shaozhong Wang、Liya Cao、Haijian Shi、Yanmei Dong、Jianwei Sun、Yuefei Hu
DOI:10.1248/cpb.53.67
日期:——
A novel and practical preparation of 2-pyridone-containing tricyclic alkaloid derivatives was developed. By regioselective intramolecular N- and C-acylation of 2-(4-aryl-2-pyridon-6-yl)benzoic acid, a pair of structural isomers 2-aryl pyrido[2,1-a]isoindole-4,6-diones and 4-aryl 1-methyl-1H-indeno[1,2-b]-pyridine-2,5-diones, as potential inhibitors of tumor cell proliferation, were prepared respectively.
Asymmetric Synthesis of 3,3-Disubstituted Isoindolinones Enabled by Organocatalytic Functionalization of Tertiary Alcohols
作者:Bin Mao、Jin-Long Wang
DOI:10.1055/s-0040-1720040
日期:2022.12
An enantioselective intramolecular heterocyclization with in situ generated 3-hydroxyisoindolinone-derived N-acyliminium ions has been successfully accomplished. In the presence of a catalytic amount of a chiral phosphoric acid, functionalized 3,3-disubstituted isoindolinones bearing N-acyl-N,O-acetal moieties were obtained with good yields and a high level of stereocontrol (up to 98:2 er). This efficient
Experiments in the Colchicine Field. V. The Thermal and Photochemical Decomposition of Various 2-(β-Phenylethyl)-phenyldiazomethanes and 2-(γ-Phenylpropyl)-phenyldiazomethanes<sup>1</sup>
作者:C. David Gutsche、Emil F. Jason、Robert S. Coffey、Herbert E. Johnson
DOI:10.1021/ja01554a043
日期:1958.11
2'-Substituted chalcone derivatives as inhibitors of interleukin-1 biosynthesis
作者:Douglas G. Batt、Robin Goodman、David G. Jones、Janet S. Kerr、Lisa R. Mantegna、Candice McAllister、Robert C. Newton、Sherrill Nurnberg、Patricia K. Welch、Maryanne B. Covington
DOI:10.1021/jm00062a016
日期:1993.5
A series of 2'-substituted chalcone derivatives has been found to show potent inhibition of the production of IL-1beta from human peripheral blood monocytes stimulated with lipopolysaccharide (LPS), with IC50 values in the 0.2-5.0-muM range. Some members of the series have also shown inhibition of septic shock induced in mice by injection of LPS, although with low potency. Qualitative structure-activity relationships have shown that the enone is required for activity, which may be mediated by conjugate addition of a biological nucleophile to the chalcone. Electron-poor aromatic rings beta to the ketone give enhanced potency. Although electronic effects in the other ring (directly attached to the ketone) are minimal, this ring must possess an ortho substituent for good activity without cytotoxicity, suggesting a degree of selectivity which would not be expected for simple, nonspecific alkylating agents.