Nucleophilic character of alkyl radicals. 18. Absolute rate constants for the addition of primary alkyl radicals to conjugated olefins and 1,4-benzoquinone
S H2 reactions of diphenyl diselenide; preparation and reactions of bridgehead selenides
作者:M. John Perkins、Eric S. Turner
DOI:10.1039/c39810000139
日期:——
benzene when R is primary alkyl; with 1-adamantyl radicals this SH2 displacement affords a route to 1-adamantyl phenyl selenide which, on oxidation and pyrolysis of the resultant selenoxide, gives adamantan-1-ol; in contrast the selenoxide from bicyclo[3.3.1]nonan-1-yl phenyl selenide decomposes via bicyclo[3.3.1]non-l-ene.
对于S H 2过程,R·+ PhSeSePh→PhSeR + PhSe·,k = ca。当R为伯烷基时,在苯中80°C,5×10 7 mol –1 s –1;具有1-金刚烷基的该S H 2置换提供了通往1-金刚烷基苯基硒化物的途径,其在所得硒氧化物的氧化和热解后,产生了金刚烷-1-醇。与此相反,从双环的氧化硒[3.3.1]壬烷-1-基苯基硒化物分解经由二环[3.3.1]壬-1-烯。
Unnatural α-Amino Acid Synthesized through α-Alkylation of Glycine Derivatives by Diacyl Peroxides
作者:Hao Tian、Wentao Xu、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.0c01574
日期:2020.7.2
We have developed a protocol for catalyst- and additive-free α-alkylationreactions of glycine derivatives with diacyl peroxides, which proceed by a pathway involving addition of alkyl radicals to imine intermediates. The diacyl peroxide substrate acts as both alkylation agent and oxidizing agent, which means it is atom-economical. It was applied to various glycine derivatives, dipeptides, and a 3
Cu-Catalyzed Alkylarylation of Vinylarenes with Masked Alkyl Electrophiles
作者:Xiaotao Zhu、Muqiao Su、Qi Zhang、Yajun Li、Hongli Bao
DOI:10.1021/acs.orglett.9b04392
日期:2020.1.17
A Cu-catalyzed synthesis of a range of value-added 1,1-diarylalkanes by radical alkylarylation of vinylarenes with alkyl peroxides as masked alkyl electrophiles is reported. The reaction features broad substrate scope, good functional group tolerance, and mild reaction conditions. Various bioactive molecules and key pharmaceutical intermediates have been easily synthesized by this method, demonstrating its synthetic value.
<b>Organic Peroxides. II. the Mechanism of the Thermal Decomposition of 6-Heptenoyl Peroxide in Toluene. the Rearrangements of the 5-Hexenyl Radical</b>
作者:Robert C. Lamb、Paul Wayne. Ayers、Myron K. Toney