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
Photoredox-Catalyzed Generation of Sulfamyl Radicals: Sulfonamidation of Enol Silyl Ether with Chlorosulfonamide
作者:Qiyu Luo、Runyu Mao、Yan Zhu、Yonghui Wang
DOI:10.1021/acs.joc.9b02062
日期:2019.11.1
A novel and practical photoredox-catalyzed generation of sulfamyl radicals followed by radical sulfonamidation of enolsilylether has been described. Diverse functionalized β-ketosulfonamides were prepared in modest to excellent yields under mild and economic reaction conditions through the present catalytic protocol. Furthermore, the methodology developed provides an efficient and convenient approach
Photoredox-catalyzed silyldifluoromethylation of silyl enol ethers
作者:Vyacheslav I Supranovich、Vitalij V Levin、Alexander D Dilman
DOI:10.3762/bjoc.16.126
日期:——
light-mediated fluoroalkylation of silyl enol ethers with (bromodifluoromethyl)trimethylsilane followed by a reduction of the primary products with sodium borohydride is described. An 18 W, 375 nm LED was used as the light source. The reaction is performed in the presence of a gold photocatalyst, which effects the generation of a (trimethylsilyl)difluoromethyl radical via cleavage of the carbon–bromine
Synthesis of β-Amino Ketones by Addition of Aryl Methyl Ketones to Sulfinimines: Application to the Total Synthesis of HPA-12, Norsedamine, and Sedamine
作者:Arava Amaranadha Reddy、Kavirayani R. Prasad
DOI:10.1021/acs.joc.7b02611
日期:2017.12.15
Synthesis of β-sulfinamido ketones was accomplished by the addition of silyl enol ethers derived from arylmethyl ketones to chiral sulfinimines in excellent yield and selectivity. Application of the formed β-amino substituted ketones is exemplified in the totalsynthesis of sphingolipid HPA-12 and the sedamine alkaloids.
Optimisation of the allylsilane approach to C-10 deoxo carba analogues of dihydroartemisinin: synthesis and in vitro antimalarial activity of new, metabolically stable C-10 analogues
作者:Paul M. O'Neill、Matthew Pugh、Andrew V. Stachulski、Stephen A. Ward、Jill Davies、B. Kevin Park
DOI:10.1039/b104340b
日期:2001.10.11
An optimised protocol has been developed for the coupling of dihydroartemisinin benzoate with a range of aromatic allylsilanes to provide a number of new C-10 deoxo derivatives (11a–11g) in yields ranging from 70 to 94%. These compounds were up to ten times more potent than artemisinin in in vitro tests against the chloroquine resistant K1 strain of Plasmodium falciparum. Ferrous mediated degradation of these analogues produces as the main product, a dicarbonyl formate 12, which is not seen when the same reaction is carried out with artemisinin or artemether. This finding may indicate that analogues in this class have a subtly different “antimalarial” mechanism of action.