Diastereo- and Enantioselective Ruthenium-Catalyzed C-C Coupling of 1-Arylpropynes and Alcohols: Alkynes as Chiral Allylmetal Precursors in Carbonyl <i>anti</i>-(α-Aryl)allylation
作者:Ming Xiang、Ankan Ghosh、Michael J. Krische
DOI:10.1021/jacs.0c12242
日期:2021.2.24
pronucleophiles in ruthenium-JOSIPHOS-catalyzed anti-diastereo- and enantioselective aldehyde (α-aryl)allylations with primary aliphatic or benzylicalcohol proelectrophiles. This method enables convergent construction of homoallylic sec-phenethyl alcohols bearing tertiary benzylic stereocenters. Both steric and electronic features of aryl sulfonic acid additives were shown to contribute to the efficiency with
Cooperative Palladium/Proline-Catalyzed Direct α-Allylic Alkylation of Ketones with Alkynes
作者:Chi Yang、Kaifan Zhang、Zijun Wu、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.6b02649
日期:2016.10.21
The cooperative palladium/l-proline-catalyzed direct α-allylic alkylation of ketones with alkynes is achieved. This reaction exhibits high atom economy since a leaving group is not liberated and a stoichiometric amount of extra oxidant is not needed. A broad range of functional groups are tolerated, and the reaction scope could be further expanded to aldehydes.
A palladium-catalyzed domino Larock annulation/dearomative Heckreaction is developed, which delivers a range of tetracyclic indoline derivatives in moderate to excellent yields through a Larock annulation of N-bromobenzoyl o-iodoanilines with alkynes and a subsequent intramolecular dearomative Heckreaction. This protocol provides a straightforward route to structurally diverse indolines from readily
Asymmetric Coupling of β-Ketocarbonyls and Alkynes by Chiral Primary Amine/Rh Synergistic Catalysis
作者:Jie Zhang、Yaning Wang、Chang You、Mingying Shi、Xueling Mi、Sanzhong Luo
DOI:10.1021/acs.orglett.1c04334
日期:2022.2.11
We herein report a synergetic chiral primaryamine and rhodium catalysis for asymmetric coupling of β-ketocarbonyls and alkynes. A series of β-ketocarbonyls could be applied to afford linear allylation products, bearing all-carbon quaternary centers in high regio- and enantioselectivities.
A regioselectivity switch in Pd-catalyzed hydroallylation of alkynes
作者:Ding-Wei Ji、Yan-Cheng Hu、Hao Zheng、Chao-Yang Zhao、Qing-An Chen、Vy M. Dong
DOI:10.1039/c9sc01527b
日期:——
Through rational evaluation of ligands and promoters, the reactivity of a key Pd(ii) species towards transmetalation or β-H elimination is manipulated.