Scope and Limitations of Auxiliary-Assisted, Palladium-Catalyzed Arylation and Alkylation of sp<sup>2</sup> and sp<sup>3</sup> C–H Bonds
作者:Enrico T. Nadres、Gerson Ivan Franco Santos、Dmitry Shabashov、Olafs Daugulis
DOI:10.1021/jo4013628
日期:2013.10.4
auxiliary-assisted direct arylation and alkylation of sp2 and sp3 C–H bonds of amine and carboxylic acid derivatives has been investigated. The method employs a palladium acetate catalyst, substrate, aryl, alkyl, benzyl, or allyl halide, and inorganic base in tert-amyl alcohol or water solvent at 100–140 °C. Aryl and alkyl iodides as well as benzyl and allyl bromides are competent reagents in this transformation
An efficient and convenient method has been developed to achieve direct silylation of unactivated remote primary or secondary C(sp3)-H bonds to form C-Si bonds with hexamethyldisilane (HMDS). This method highlights...
An Efficient Palladium-Catalyzed CH Alkoxylation of Unactivated Methylene and Methyl Groups with Cyclic Hypervalent Iodine (I<sup>3+</sup>) Oxidants
作者:Gang Shan、Xinglin Yang、Yu Zong、Yu Rao
DOI:10.1002/anie.201307090
日期:2013.12.16
All the hype: The title reaction has been developed for the facile synthesis of a variety of complex alkyl ethers. Cyclichypervalentiodine (I3+) reagents serve as oxidants for this unique CHalkoxylation reaction. The reaction demonstrates excellent reactivity, good functional‐group tolerance, and high yields. Q=8‐aminoquinoline‐derived auxiliary.
Unprecedented copper-mediated oxidative demethylation of propionamides via bidentate-chelation assistance
作者:Jing-Hui Liu、Mian Cui、Xiao-Yu Lu、Zhen-Qi Zhang、Bin Xiao、Yao Fu
DOI:10.1039/c5cc08393a
日期:——
The copper-mediated bidentate-chelation directing group assisted oxidative demethylation of substituted propionamides was developed for the first time.
首次开发了铜介导的双齿螯合定向基辅助的取代丙酰胺的氧化去甲基化反应。
Divergent and Stereoselective Synthesis of β-Silyl-α-Amino Acids through Palladium-Catalyzed Intermolecular Silylation of Unactivated Primary and Secondary C−H Bonds
作者:Yue-Jin Liu、Yan-Hua Liu、Zhuo-Zhuo Zhang、Sheng-Yi Yan、Kai Chen、Bing-Feng Shi
DOI:10.1002/anie.201607766
日期:2016.10.24
A general and practical PdII‐catalyzed intermolecularsilylation of primary and secondaryC−Hbonds of α‐amino acids and simple aliphatic acids is reported. This method provides divergent and stereoselective access to a variety of optical pure β‐silyl‐α‐amino acids, which are useful for genetic technologies and proteomics. It can also be readily performed on a gram scale and the auxiliary can be easily