The Cinchona Primary Amine-Catalyzed Asymmetric Epoxidation and Hydroperoxidation of α,β-Unsaturated Carbonyl Compounds with Hydrogen Peroxide
作者:Olga Lifchits、Manuel Mahlau、Corinna M. Reisinger、Anna Lee、Christophe Farès、Iakov Polyak、Gopinadhanpillai Gopakumar、Walter Thiel、Benjamin List
DOI:10.1021/ja402058v
日期:2013.5.1
Using cinchona alkaloid-derived primary amines as catalysts and aqueous hydrogenperoxide as the oxidant, we have developed highly enantioselective Weitz-Scheffer-type epoxidation and hydroperoxidation reactions of α,β-unsaturated carbonylcompounds (up to 99.5:0.5 er). In this article, we present our full studies on this family of reactions, employing acyclic enones, 5-15-membered cyclic enones, and
A new and versatile route for the synthesis of highly substituted benzenoids
作者:Jeffrey A. Robl
DOI:10.1016/s0040-4039(00)97412-4
日期:1990.1
A newroute for the synthesis of highly substituted benzenoids has been developed. Key steps include the conversion of unsaturated lactone 7 to carboxy substituted cyclohexenone 8 followed aromatization to give phenol 9. The phenolic functionality provides a handle for further modification to give substituted benzenoids of type 2.
Enamine chemistry. Part IX. Synthesis, structure, and spectra of acyclic dienamines; linear versus cross-conjugation
作者:P. W. Hickmott、B. J. Hopkins、C. T. Yoxall
DOI:10.1039/j29710000205
日期:——
formation of an equilibrium mixture of linear and cross-conjugated dienamines, the latter being the more stable thermodynamically. The stereochemistry and spectra of the dienamines and of the corresponding unsaturated ketones formed on hydrolysis are reported, and the course of the conversion of methyl alkyl ketones, and of their monoenamines, into dienamines is discussed.
Synthetic approaches to phomactins: Novel oxidation of homoallylic alcohols using tetra-n-propylammonium perruthenate
作者:Timothy J. Blackburn、Eric J. Thomas
DOI:10.1016/j.tet.2018.05.068
日期:2018.9
step in the synthesis was to be the epoxidation of this methylenecyclohexane that was hoped would lead to a 1-(hydroxymethyl)cyclohexene by rearrangement of the exocyclic epoxide, but the epoxidation was difficult to carry out regioselectively on advanced intermediates. However, oxidation of a 15-methylenebicyclo[9.3.1]pentadeca-3,7-dien-14-ol using tetra-n-propylammonium perruthenate and N-methylmorpholine-N-oxide
Ternary Electron Donor–Acceptor Complex Enabled Enantioselective Radical Additions to α, β-Unsaturated Carbonyl Compounds
作者:Jae Yeon Kim、Yea Suel Lee、Do Hyun Ryu
DOI:10.1021/acscatal.1c04835
日期:2021.12.17
An electrondonor–acceptor (EDA) complex is an associationbetween a Lewis base (electron donor) and a Lewis acid (electronacceptor) in the ground state. The EDA complex has received widespread attention and been recognized as an attractive synthetic method because this complex can generate active radical ion pairs by light irradiation in mild reaction conditions and does not require any additional