Water as a Hydride Source in Palladium-Catalyzed Enantioselective Reductive Heck Reactions
作者:Wangqing Kong、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201700195
日期:2017.3.27
Pd‐catalyzed intramolecular asymmetric carbopalladation of N‐aryl acrylamides followed by reduction of C(sp3)‐Pd intermediate using diboron–water as a hydride source afforded enantioenriched 3,3‐disubstituted oxindoles in high yields and enantioselectivities. When heavy water was used as a deuterium donor in combination with bis(catecholato)diboron (Cat2B2), deuterium was incorporated into the products
N芳基丙烯酰胺在Pd催化下的分子内不对称碳环合钯,然后使用乙硼酸水作为氢化物源还原C(sp 3)-Pd中间体,从而以高收率和对映选择性提供了对映体富集的3,3-二取代的吲哚。当重水与双(邻苯二酚)二硼(Cat 2 B 2)一起用作氘供体时,氘以高合成效率掺入产品中。配体决定了反应的对映选择性和反应路径,从而提供了氢芳基化(还原性Heck)或碳硼化产物。
Nickel-Catalyzed Arylation of C(sp<sup>3</sup>)–O Bonds in Allylic Alkyl Ethers with Organoboron Compounds
作者:Xiaowei Li、Yuxiu Li、Zhong Zhang、Xiaolin Shi、Ruihua Liu、Zemin Wang、Xiangqian Li、Dayong Shi
DOI:10.1021/acs.orglett.1c01879
日期:2021.9.3
A nickel-catalyzed cross-coupling of allylic alkyl ethers with organoboron compounds through the cleavage of the inert C(sp3)-O(alkyl) bonds is described. Several types of allylic alkyl ethers can be coupled with various boronic acids or their derivatives to give the corresponding products in good to excellent yields with wide functional group tolerance and excellent regioselectivity. The gram-scale
Palladium-Catalyzed Enantioselective Domino Heck/Intermolecular C–H Bond Functionalization: Development and Application to the Synthesis of (+)-Esermethole
作者:Wangqing Kong、Qian Wang、Jieping Zhu
DOI:10.1021/jacs.5b11625
日期:2015.12.30
Intramolecular asymmetric carbopalladation of N-aryl acrylamides followed by intermolecular trapping of the resulting σ-C(sp(3))-Pd complex by azoles afforded 3,3-disubstituted oxindoles in good yields with excellent enantioselectivities. Two C-C bonds were created with concurrent formation of an all-carbon quaternary stereocenter. Oxadiazole substituted oxindoles were subsequently converted to pyrroloindolines
N-芳基丙烯酰胺的分子内不对称碳钯化,然后用唑类分子间捕获所得的 σ-C(sp(3))-Pd 复合物,以良好的收率和出色的对映选择性提供了 3,3-二取代的羟吲哚。创建了两个 CC 键,同时形成了一个全碳四元立体中心。恶二唑取代的羟吲哚随后通过前所未有的还原环化方案转化为吡咯并二氢吲哚。(+)-esermethole 的对映选择性合成说明了这种化学的效用。
Catalytic Enantioselective Double Carbopalladation/C−H Functionalization with Statistical Amplification of Product Enantiopurity: A Convertible Linker Approach
oxadiazole to afford homodimers in good yields with excellent enantiomeric excesses (ee). The dimer was subsequently converted into a structurally elaborated monomer in which the linker (oxadiazole) was incorporated into the target product.
Ni-Catalyzed Enantioselective Reductive Diarylation of Activated Alkenes by Domino Cyclization/Cross-Coupling
作者:Kuai Wang、Zhengtian Ding、Zhijun Zhou、Wangqing Kong
DOI:10.1021/jacs.8b08190
日期:2018.10.3
A Ni-catalyzed enantioselective reductive diarylation of activated alkenes by domino cyclizative/ cross-coupling of two aryl bromides is developed. This reaction proceeds under very mild conditions and shows broad substrate scope, without requiring the use of preformed organometallic reagents. Moreover, this approach provides direct access to various bis-heterocycles bearing all-carbon quaternary centers in synthetically useful yields (up to 81%) with excellent enantioselectivity (>30 examples, 90-99% ee).