Photoredox-Catalyzed Decarboxylative Alkylation of Silyl Enol Ethers To Synthesize Functionalized Aryl Alkyl Ketones
作者:Weiguang Kong、Changjiang Yu、Hejun An、Qiuling Song
DOI:10.1021/acs.orglett.7b03587
日期:2018.1.19
Photoredox-catalyzed decarboxylative alkylation of silylenolethers has been developed. Diverse functionalized arylalkylketones were afforded in modest to good yields using N-(acyloxy)phthalimide as an easy access alkyl radical source under mild and operationally simple conditions. The excellent performance of drug molecules such as fenbufen and indomethacin and naturally occurring carboxylic acids
has recently been generated from hypervalent iodine precursors via photoredox catalysis. Given the underexplored chemistry of carbyne, due to the paucity of carbyne sources, we are intrigued to discover a new source for this reactive species from classical reagents – phosphonium ylides. Our novel strategy employing phosphonium ylides in an olefin hydrocarbonation reaction features a facile approach
Synthesis and biological activity of a novel series of indole-derived PPARγ agonists
作者:Brad R. Henke、Kimberley K. Adkison、Steven G. Blanchard、Lisa M. Leesnitzer、Robert A. Mook、Kelli D. Plunket、John A. Ray、Claudia Roberson、Rayomand Unwalla、Timothy M. Willson
DOI:10.1016/s0960-894x(99)00603-4
日期:1999.12
The synthesis and structure-activity relationships of a novel series of indole 5-carboxylicacids that bind and activate peroxisome proliferator-activated receptor gamma (PPARgamma) are reported. These new analogs are selective for PPARgamma vs the other PPAR subtypes, and the most potent compounds in this series are comparable to in vitro potencies at PPARgamma reported for the thiazolidinedione-based
<scp>Nickel‐Catalyzed Cross‐Coupling</scp>
of Aryl Pivalates with Cyclobutanols Involving C—O and C—C Bond Cleavage
<sup>†</sup>
作者:Yi Gan、Ninghui Zhang、Shaoxu Huang、Yuanhong Liu
DOI:10.1002/cjoc.202000319
日期:2020.12
An efficient nickel‐catalyzed cross‐coupling of aryl pivalates with cyclobutanols is described. The use of Ni(cod)2/PCy3/base as the catalytic system enables the cleavage of inert C—O bond and C—Cbond under mild conditions, thus providing a facile access to γ‐arylated ketones in generally good to excellent yields. This transformation is also characterized by wide substrate scope and functional group
An intermolecular reductive C–C coupling of electrophilic alkyl radicals and alkenes has been developed. Thiols were used as both hydrogen-donating reagents and alkyl radical precursors in the presence of triethyl phosphite and radical initiator. A wide range of alkenes, including styrenes, and aliphatic olefins were well tolerated in this transformation. Mechanistic studies indicated that a phosphite