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.
Palladium-catalyzed unactivated β-methylene C(sp<sup>3</sup>)–H bond alkenylation of aliphatic amides and its application in a sequential C(sp<sup>3</sup>)–H/C(sp<sup>2</sup>)–H bond alkenylation
作者:Gang Shan、Guiyi Huang、Yu Rao
DOI:10.1039/c4ob02389g
日期:——
palladium(II)-catalyzed β-methylene C(sp3)–H bondalkenylation of acyclic aliphatic amides with alkenyl halides has been developed. Both (E)-olefins and (Z)-olefins can be readily accessed using this method and a possible (Z)/(E)-olefin isomerization pathway is proposed. A solvent effect-promoted sequential C(sp3)–H bondalkenylation and C(sp2)–H bondalkenylation was also studied, and can provide a
Palladium-catalyzed ligand-promoted site-selective cyanomethylation of unactivated C(sp<sup>3</sup>)–H bonds with acetonitrile
作者:Yongbing Liu、Ke Yang、Haibo Ge
DOI:10.1039/c5sc04066c
日期:——
The direct coupling of unactivatedsp3 C-H bonds in aliphatic amides with acetonitrile was achieved via palladium catalysis.
脂族酰胺中未活化的sp 3 CH键与乙腈的直接偶联是通过钯催化实现的。
Pd(<scp>ii</scp>)-catalyzed β- and γ-C-(sp<sup>3</sup>)–H dienylation with allenyl acetates
作者:Rahul K. Shukla、Akshay M. Nair、Chandra M. R. Volla
DOI:10.1039/d2sc05188e
日期:——
metal catalyzed C–H activation as a powerful synthetic tool in organic chemistry. Allenes have fascinated synthetic chemists due to their unique reactivity. While directinggroup assisted functionalization of C(sp2)–H bonds with allenes is well documented in the literature, their coupling with more challenging aliphatic C(sp3)–H bonds remains elusive. In this regard, we hereby report a Pd(II) catalyzed
Palladium-Catalyzed H/D Exchange Reaction with 8-Aminoquinoline as the Directing Group: Access to ortho-Selective Deuterated Aromatic Acids and β-Selective Deuterated Aliphatic Acids
We develop a palladium-catalyzed H/D exchange reaction with 8-aminoquinoline as the directing group as well as D2O as the source of deuterium atom and solvent. This reaction achieves selectively H/D exchange at the ortho-C–H of aromatic amides and the β-C–H of aliphatic amide. Ortho-deuterated aromatic acids and β-deuterated aliphatic acids are obtained by removal of the directing group. And a possible