Catalytic asymmetric trifluoromethylthiolation via enantioselective [2,3]-sigmatropic rearrangement of sulfonium ylides
作者:Zhikun Zhang、Zhe Sheng、Weizhi Yu、Guojiao Wu、Rui Zhang、Wen-Dao Chu、Yan Zhang、Jianbo Wang
DOI:10.1038/nchem.2789
日期:2017.10
into a variety of molecules, there remain significant challenges regarding the enantioselective synthesis of SCF3-containing compounds. Here, an asymmetric trifluoromethylthiolation that proceeds through the enantioselective [2,3]-sigmatropicrearrangement of a sulfonium ylide generated from a metal carbene and sulfide (Doyle–Kirmse reaction) has been developed using chiral Rh(II) and Cu(I) catalysts
Catalyst-Controlled Selective Alkylation/Cyclopropanation of Indoles with Vinyl Diazoesters
作者:Zhen Wang、Guangyang Xu、Shengbiao Tang、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.9b03323
日期:2019.10.18
A catalyst-controlled selective functionalization of indoles with vinyl diazoacetates has been developed. The use of gold catalysts exclusively leads to C3-alkylation products, whereas the highly diastereoselective cyclopropanation reaction is dominant for silver catalysis. Importantly, the gold and silver vinylcarbenes exhibit highly carbenic rather than vinylogous reactivity in these transformations
Gold(I)-Catalyzed Diazo Cross-Coupling: A Selective and Ligand-Controlled Denitrogenation/Cyclization Cascade
作者:Guangyang Xu、Chenghao Zhu、Weijin Gu、Jian Li、Jiangtao Sun
DOI:10.1002/anie.201409845
日期:2015.1.12
unprecedented gold‐catalyzed ligand‐controlled cross‐coupling of diazo compounds by sequential selectivedenitrogenation and cyclization affords N‐substituted pyrazoles in a position‐switchable mode. This novel transformation features selective decomposition of one diazo moiety and simultaneous preservation of the other one from two substrates. Notably, the choice of the ancillary ligand to the gold complex
Highly Enantioselective Rh<sub>2</sub>(<i>S</i>-DOSP)<sub>4</sub>-Catalyzed Cyclopropenation of Alkynes with Styryldiazoacetates
作者:John F. Briones、Jørn Hansen、Kenneth I. Hardcastle、Jochen Autschbach、Huw M. L. Davies
DOI:10.1021/ja106509b
日期:2010.12.8
Dirhodium tetrakis((S)-N-(dodecylbenzenesulfonyl)prolinate) (Rh2(S-DOSP)4) is an effective catalyst for highlyenantioselectivecyclopropenationreactions between terminal alkynes and arylvinyldiazoacetates. The resulting vinylcyclopropenes can undergo rhodium-catalyzed regioselective rearrangement to cyclopentadienes. Computational studies indicate that the high enantioselectivity of the process is
Enantioselective Gold(I)-Catalyzed Vinylogous [3 + 2] Cycloaddition between Vinyldiazoacetates and Enol Ethers
作者:John F. Briones、Huw M. L. Davies
DOI:10.1021/ja407179c
日期:2013.9.11
vinyldiazoacetates with enolethers catalyzed by the binuclear gold complex (R)-DTBMSegphos(AuCl)2 activated by silver hexafluoroantimonate results in a highly enantioselective [3 + 2] cycloaddition. The [3 + 2] cycloaddition proceeds with dynamic kinetic resolution when the enolether is a 4-substituted 1-(methoxymethylene)cyclohexane. The reaction is initiated by nucleophilic attack of the vinyl ethers at the vinylogous