[EN] CATALYTICS ASYMMETRIC ACTIVATION OF UNACTIVATED C-H BONDS, AND COMPOUNDS RELATED THERETO<br/>[FR] ACTIVATION CATALYTIQUE ASYMETRIQUE DE LIAISONS C-H INACTIVEES ET COMPOSES ASSOCIES
申请人:UNIV BRANDEIS
公开号:WO2006026053A1
公开(公告)日:2006-03-09
One aspect of the present invention is directed in part to catalytic and stereoselective functionalization of unactivated C-H bonds of simple organic substrates. The compounds and methods provided herein allow one to control the stereochemistry in a C-H activation step, activate substrates containing α-hydrogens next to the directing group, and remove a directing group under mild conditions. One aspect of the present invention relates to a transition-metal-catalyzed method for selective and asymmetric oxidation of carbons located in a β- or Ϝ-position relative to an auxiliary. Another aspect of the invention relates to the enantiomerically-enriched substrates and the enantiomerically-enriched products formed via said method. In certain embodiments, oxazoline and oxazinone directing groups are used. In addition, the Boc protecting group has been identified as a directing group which does not necessitate removal.
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
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
Cyclopentenones are synthetically versatile structures, and their straightforward construction from alkynone substrates by employing synthetically streamlining C-H insertion is conceptually appealing and of high synthetic potential. But, its implementation is very limited. Herein we report a Au-catalyzed version, which affords 2-bromocyclopent-2-en-1-ones with a broad scope and synthetically desirable
环戊烯酮是合成通用的结构,它们通过合成流线型 CH 插入从炔酮底物直接构建在概念上具有吸引力且具有高合成潜力。但是,它的实施非常有限。在此我们报告了一种 Au 催化的版本,它提供了具有广泛范围和合成所需的非对映选择性的 2-bromocyclopent-2-en-1-ones。所提出的能够插入未活化 CH 键的关键中间体是一种完全功能化的金亚乙烯基,它是通过一种新的分子间策略产生的。这种可能的金亚乙烯基的灵活获取为探索其多功能反应性提供了各种机会。
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。