Scalable, Electrochemical Oxidation of Unactivated C–H Bonds
作者:Yu Kawamata、Ming Yan、Zhiqing Liu、Deng-Hui Bao、Jinshan Chen、Jeremy T. Starr、Phil S. Baran
DOI:10.1021/jacs.7b03539
日期:2017.6.7
A practical electrochemical oxidation of unactivated C–H bonds is presented. This reaction utilizes a simple redox mediator, quinuclidine, with inexpensive carbon and nickel electrodes to selectivelyfunctionalize “deep-seated” methylene and methine moieties. The process exhibits a broad scope and good functional group compatibility. The scalability, as illustrated by a 50 g scale oxidation of sclareolide
Desymmetrizing asymmetric ring expansion: stereoselective synthesis of 7-membered cyclic β-keto carbonyl compounds with an α-hydrogen
作者:Takuya Hashimoto、Yuki Naganawa、Keiji Maruoka
DOI:10.1039/c0cc01424a
日期:——
Ring expansion of symmetrically substituted cyclohexanones with N-α-diazoacetyl camphorsultam was devised as a stereoselective pathway to the functionalized 7-membered cyclic β-keto carbonyls having a kinetically stabilized α-hydrogen.
Desymmetrizing Asymmetric Ring Expansion of Cyclohexanones with α-Diazoacetates Catalyzed by Chiral Aluminum Lewis Acid
作者:Takuya Hashimoto、Yuki Naganawa、Keiji Maruoka
DOI:10.1021/ja202070j
日期:2011.6.15
in a 2:1 ratio was found to promote novel catalytic asymmetric ring expansion of cyclohexanone with α-substituted α-diazoacetates to give seven-membered rings with an all-carbon quaternary center. Application of this strategy to 4-substituted cyclohexanones opened up a novel way for the catalytic desymmetrizing asymmetric construction of cycloheptanones bearing remote α,δ-chiral centers.