Gold(I)/Gold(III) Catalysis that Merges Oxidative Addition and π‐Alkene Activation
作者:Mathilde Rigoulet、Olivier Thillaye du Boullay、Abderrahmane Amgoune、Didier Bourissou
DOI:10.1002/anie.202006074
日期:2020.9.14
possibility to combine oxidative addition of aryl iodides and π‐activation of alkenes at gold is demonstrated for the first time. The reaction is robust and general (>30 examples including internal alkenes, 5‐, 6‐, and 7‐membered rings). It is regioselective and leads exclusively to trans addition products. The (P,N) gold complex is most efficient with electron‐rich aryl substrates, which are troublesome
(MeDalphos)AuCl络合物通过Au I / Au III催化可有效实现烯烃与芳基碘的杂芳基化反应。首次证明了在金中结合芳基碘化物的氧化加成和烯烃的π-活化的可能性。该反应牢固且通用(> 30个实例,包括内部烯烃,5元,6元和7元环)。它是区域选择性的,专门导致反式加成产物。(P,N)金络合物在富电子芳基底物方面效率最高,这对于其他光氧化还原/氧化方法来说是麻烦的。此外,它还提供了从5外向内向6内向区域选择性的非常不同的转换 内部烯醇的Z和E异构体之间的环化。
NHC-Catalyzed Ring Expansion of Oxacycloalkane-2-carboxaldehydes: A Versatile Synthesis of Lactones
作者:Li Wang、Karen Thai、Michel Gravel
DOI:10.1021/ol8029005
日期:2009.2.19
Imidazolinium-derived carbenes catalyze the ring-expansion lactonization of oxacycloalkane-2-carboxaldehydes. A variety of functionalized five-, six-, and seven-memberedlactones can be formed efficiently under mild reaction conditions. The success of this new method for the construction of lactones is highly influenced by the electronic nature of the carbene catalyst.
Multi-Metal-Catalyzed Oxidative Radical Alkynylation with Terminal Alkynes: A New Strategy for C(sp<sup>3</sup>)–C(sp) Bond Formation
作者:Shan Tang、Yichang Liu、Xinlong Gao、Pan Wang、Pengfei Huang、Aiwen Lei
DOI:10.1021/jacs.8b02745
日期:2018.5.9
for C(sp3)-C(sp) cross-coupling with terminalalkynes has been developed by using a multi-metal-catalyzed reaction strategy. Alkyl radicals generated from different approaches are able to couple with terminalalkynes by judicious selection of the catalyst combination. This reaction protocol offers an efficient alternative approach for the synthesis of substituted alkynes from terminalalkynes besides
Switching substitution groups on the in-tether chiral centre influences backbone peptides’ permeability and target binding affinity
作者:Yixiang Jiang、Kuan Hu、Xiaodong Shi、Qingzhuang Tang、ZiChen Wang、Xiyang Ye、Zigang Li
DOI:10.1039/c6ob02289h
日期:——
Different in-tether chiral centres show distinguishable properties, proving in-tether chiral centres are a valuable modification site for constructing peptide ligands.
在-锚定手性中心不同的情况下显示出可区分的特性,证明了在-锚定手性中心是构建肽配体的宝贵修饰位点。
Striking AcOH Acceleration in Direct Intramolecular Allylic Amination Reactions
作者:Fady Nahra、Frédéric Liron、Guillaume Prestat、Carlo Mealli、Abdelatif Messaoudi、Giovanni Poli
DOI:10.1002/chem.200901946
日期:2009.10.26
An acid–base reaction to speed up a sluggish catalytic cycle! AcOH as the solvent enables extraordinarily fast and efficient PdII‐catalysed, directintramolecularallylicaminations, assisting the benzoquinone‐mediated palladium reoxidation and ionisation of the intermediate palladium complexes (see scheme). The structural and energetic aspects of such a key step of the catalytic cycle are illustrated