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
Various β-nitro ketones, including those bearing a β-tertiary carbon, were prepared from geminal bromonitroalkanes and trimethylsilyl enol ethers of a broad range of ketones by visiblelightphotoredoxcatalysis, which were then easily converted into β-amino ketones, 1,3-amino alcohols, α,β-unsaturated ketones, β-cyano ketones and γ-nitro ketones.
Silver catalyzed proto- and sila-Nakamura-type α-vinylation of silyl enol ethers with dichloroacetylene. Divergent formation of stereochemically pure tri- and tetrasubstituted olefins
作者:Lun Li、Kimberly A. Wasik、Brian J. Frost、Laina M. Geary
DOI:10.1016/j.tetlet.2019.151370
日期:2020.1
described. When DCA was used as a solution in diethyl ether, we found that the silyl group was transferred to the vinyl group, resulting in stereochemically pure tetrasubstituted olefins. However, when DCA was used as a solution in the more polar acetonitrile, protonation was the major pathway, and trisubstituted olefins were the dominant products.
C2-ketonylation of carbohydrates <i>via</i> excited-state palladium-catalyzed 1,2-spin-center shift
作者:Gaoyuan Zhao、Upasana Mukherjee、Lin Zhou、Yue Wu、Wang Yao、Jaclyn N. Mauro、Peng Liu、Ming-Yu Ngai
DOI:10.1039/d2sc01042a
日期:——
C2-ketonyl-2-deoxysugars, sugars with the C2-hydroxyl group replaced by a ketone side chain, are important carbohydrate mimetics in glycobiology and drug discovery studies; however, their preparation remains a vital challenge in organic synthesis. Here we report the first direct strategy to synthesize this class of glycomimetics from readily available 1-bromosugars and silyl enol ethers via an excited-state
A general arene C–H functionalization strategy via electron donor–acceptor complex photoactivation
作者:Abhishek Dewanji、Leendert van Dalsen、James A. Rossi-Ashton、Eloise Gasson、Giacomo E. M. Crisenza、David J. Procter
DOI:10.1038/s41557-022-01092-y
日期:2023.1
The photoactivation of electron donor–acceptor complexes has emerged as a sustainable, selective and versatile strategy for the generation of radical species. However, when it comes to aryl radical formation, this strategy remains hamstrung by the electronic properties of the aromatic radical precursors, and electron-deficient aryl halide acceptors are required. This has prevented the implementation
Developing a transition-metal-free green protocol for the electrophilic hydrazination of silyl enol ethers using diazo electrophiles with EtOH–H<sub>2</sub>O as a safe solvent
作者:Subba Rao Polimera、Andivelu Ilangovan、Murugaiah A. M. Subbaiah
DOI:10.1039/d2gc04607e
日期:——
electrophilic hydrazination of difluoro-substituted or desfluoro silylenolethers with diazo systems as electrophiles was examined. In contrast to conventional protocols that use a metal catalyst, a HF reagent, and chlorinated or ethereal solvents and are conducted at energy-inefficient low temperatures under an inert atmosphere, the new method allows reactions to be performed under metal- and HF-free