Oxidative Cleavage of Diselenide by<i>m</i>-Nitrobenzenesulfonyl Peroxide. Novel Method for the Electrophilic Benzeneselenenylations of Olefins and Aromatic Rings
acetic acid, phenol, and anisole could be employed; oxyselenenylated ((Remark: Graphics omitted.) : R=H, Me, Ac, and Ph) and arylselenenylated ((Remark: Graphics omitted.) : R=H and Me) adducts were afforded. Phenol gave oxyselenenylated products in cyclohexene or 1-octene and arylselenenylated products in styrene. Efficient intramolecular cyclizations of unsaturated alcohols and carboxylic acids were
Oxidation of Diphenyl Diselenide with 2,3-Dichloro-5,6-dicyanobenzoquinone (DDQ). A New Method for the Electrophilic Phenylselenenylation of Alkenes under Mild Conditions
The oxidation of diphenyl diselenide with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) represents a convenient mild method to produce a strongly electrophilic phenylselenium reagent. Clean phenylseleno methoxylations and hydroxylations of alkenes containing different types of functional groups can be effected by working in methanol or in acetonitrile and water, respectively. This new electrophilic reagent can also be employed to promote efficient cyclization reactions of alkenols to tetrahydrofurans or of alkenoic acids to lactones.
Organoselenium-induced cyclizations in organic synthesis
作者:K.C. Nicolaou
DOI:10.1016/s0040-4020(01)93285-5
日期:——
A number of organoselenium reagents are introduced as efficient initiators of ringclosures leading from unsaturated substrates to lactones, cyclicethers, cyclic thioethers, N-heterocycles and carbocycles. These cyclizations often proceed with high ring selectivity and stereoselectivity and are accompanied by the incorporation of the phenylseleno group (PhSe) into the final product. Methods are described
A time-economical and robust synthesis of various selenofunctionalized heterocycles was accomplished via I2O5-mediated selenocyclizations of olefins with diselenides. Using this method, 116 selenomethyl-substituted heterocycles were synthesized with up to 97% isolated yield in minutes. Additional features of this new protocol include the use of an inorganic oxidant, mild conditions, and easy operation
通过I 2 O 5介导的烯烃与二硒化物的硒环化,实现了各种硒官能化杂环的经济且稳健的合成。使用这种方法,在几分钟内合成了 116 个硒甲基取代的杂环,分离产率高达 97%。这个新协议的其他特点包括使用无机氧化剂、温和的条件和易于操作。初步研究表明,这种转化是通过硒基碘诱导的亲电环化进行的。
Electrochemical Difunctionalization of Olefines: Access to Selenomethyl‐Substituted Cyclic Ethers or Lactones
作者:Xiu‐Jin Meng、Ping‐Fu Zhong、Yu‐Mei Wang、Heng‐Shan Wang、Hai‐Tao Tang、Ying‐Ming Pan
DOI:10.1002/adsc.201901115
日期:2020.2.6
A metal‐ and oxidant‐free electrochemical method for preparing selenomethyl‐substituted cyclic ethers or lactones via difunctionalization of olefines is presented. A series of selenomethyl‐substituted cyclic ethers, particularly 9‐ and 11‐ membered, selenomethyl‐substituted lactones (4‐6 membered), and selenomethyl‐substituted phthalides can be obtained via this reaction. This method features convenient