Nickel-Catalyzed Direct C (sp3)–H Arylation of Aliphatic Amides with Thiophenes
摘要:
Nickel-catalyzed heteroarylation of the inactive methyl C(sp(3))-H bond of aliphatic amide with heteroarenes is described. The method takes advantage of chelation assistance by an 8-aminoquinolinyl moiety. The synthetic reaction has good tolerance toward functional groups, and it can be used in the construction of various hinds of alkyl-substituted heteroarenes.
Copper-Catalyzed Site-Selective Intramolecular Amidation of Unactivated C(sp<sup>3</sup>)H Bonds
作者:Xuesong Wu、Yan Zhao、Guangwu Zhang、Haibo Ge
DOI:10.1002/anie.201311263
日期:2014.4.1
of aliphatic amides, directed by a bidentate ligand, was developed using a copper‐catalyzed sp3 CH bond functionalization process. The reaction favors predominantly the CHbonds of β‐methyl groups over the unactivated methylene CHbonds. Moreover, a preference for activating sp3 CHbonds of β‐methyl groups, via a five‐membered ring intermediate, over the aromatic sp2 CHbonds was also observed in
Nickel-catalyzed directed sulfenylation of sp<sup>2</sup> and sp<sup>3</sup> C–H bonds
作者:Xiaohan Ye、Jeffrey L. Petersen、Xiaodong Shi
DOI:10.1039/c5cc01970b
日期:——
Directed sulfenylation of both sp2 and sp3 C–H bonds was achieved through nickel catalyzed directed C–S bond formation, giving the desired product in good to excellent yield (up to 90%).
Readily Removable Directing Group Assisted Chemo- and Regioselective C(sp<sup>3</sup>)H Activation by Palladium Catalysis
作者:Yun-Fei Zhang、Hong-Wei Zhao、Hui Wang、Jiang-Bo Wei、Zhang-Jie Shi
DOI:10.1002/anie.201505932
日期:2015.11.9
Currently used directing groups for selective aliphatic β‐functionalization of carbonyl compounds show excellent reactivity and selectivity with an amide as a linker. Described herein is 2‐piconimide, used for the first time with commercially available 2‐picolinamide/2‐picolic acid as precursors, to directCH arylation/alkenylation by palladium catalysis. The directing group is essential for promoting
Palladium(0)/PAr<sub>3</sub>-Catalyzed Intermolecular Amination of C(sp<sup>3</sup>)H Bonds: Synthesis of β-Amino Acids
作者:Jian He、Toshihiko Shigenari、Jin-Quan Yu
DOI:10.1002/anie.201502075
日期:2015.5.26
An intermolecularC(sp3)Hamination using a Pd0/PAr3 catalyst was developed. The reaction begins with oxidative addition of R2NOBz to a Pd0/PAr3 catalyst and subsequent cleavage of a C(sp3)H bond by the generated PdNR2 intermediate. The catalytic cycle proceeds without the need for external oxidants in a similar manner to the extensively studied palladium(0)‐catalyzed CH arylation reactions. The
分子间C(SP 3) ħ胺化使用Pd 0 / PAR 3催化剂的开发。反应开始与氧化加成的R 2 Ñ OBZ给PD 0 / PAR 3催化剂和C的随后裂解(SP 3) H键由所生成的Pd NR 2中间。与广泛研究的钯(0)催化的CH芳基化反应相似,无需外部氧化剂即可进行催化循环。缺电子的三芳基膦配体对此C(SP 3)至关重要发生氨化反应。