Arynes were found to insert into carbonâhalogen Ï-bonds of various acid halides, enabling acyl and halogen moieties to be introduced simultaneously into adjacent positions of aromatic rings.
Facile epoxidation of α,β-unsaturated ketones with cyclohexylidenebishydroperoxide
作者:Kavitha Jakka、Jinyun Liu、Cong-Gui Zhao
DOI:10.1016/j.tetlet.2006.12.104
日期:2007.2
Cyclohexylidenebishydroperoxide was successfully used as the oxygen source for the oxidation of α,β-unsaturatedketones for the first time. The corresponding epoxides were obtained in excellent yields under the Weitz–Scheffer reaction conditions.
photoepoxidation of α,β-unsaturated ketones driven by visible light in the presence of tetramethylguanidine (3b), tetraphenylporphine (H2TPP), and molecular oxygen under mild conditions was revealed. The corresponding α,β-epoxy ketones were obtained in yields of up to 94% in 96 h. The reaction time was shortened to 4.6 h by flow synthesis. The mechanism related to singlet oxygen was supported by experiments
TMAF-Catalyzed Conjugate Addition of Oxazolidinone and Thiols
作者:Vincent Dalla、Mickaël Ménand
DOI:10.1055/s-2004-836057
日期:——
TMAF (Me4NF) is a useful catalyst for the conjugate addition of oxazolidinone and thiols to a range of Michael acceptors including esters, ketones, nitroolefins and cinnamaldehyde.
Facile Epoxidation of α,β-Unsaturated Ketones with trans-3,5-Dihydroperoxy-3,5-dimethyl-1,2-dioxolane as an Efficient Oxidant
作者:Davood Azarifar、Kaveh Khosravi
DOI:10.1055/s-0030-1258996
日期:2010.11
Application of trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane as an efficient oxygen source has been explored in the epoxidation of trans-chalcones. The reactions proceed under mild conditions at room temperature in alkaline solution to afford the corresponding epoxides in excellent yields.