Synthesis of 1-Amino-2<i>H</i>-quinolizin-2-one Scaffolds by Tandem Silver Catalysis
作者:Xiao-Long Min、Chao Sun、Ying He
DOI:10.1021/acs.orglett.8b03935
日期:2019.2.1
An efficient tandem cycloisomerization–amination reaction catalyzed by silver is described. This rapid and atom-economic reaction delivered 1-amino-2H-quinolizin-2-one scaffolds in high yields under mild conditions. The reaction could be extended to an asymmetric version albeit with moderate enantioselective excess of the products. In addition, the products can be easily reduced into various azabicycles
Palladium-catalyzed cascade carboesterification of norbornene with alkynes
作者:Wanqing Wu、Can Li、Jianxiao Li、Huanfeng Jiang
DOI:10.1039/c8ob01799a
日期:——
An efficient and convenient palladium-catalyzed cascade carboesterification of norbornenes (NBE) with alkynes has been accomplished to afford functionalized α-methylene γ-lactone and tetrahydrofuran derivatives in good to excellent yields. This new strategy exhibits excellent atom- and step-economy, good functional group tolerance and broad substrate scope. In particular, NBE-palladium species was
Organocatalytic
<i>trans</i>
Phosphinoboration of Internal Alkynes
作者:Russell G. Fritzemeier、Jan Nekvinda、Christopher M. Vogels、Carol Ann Rosenblum、Carla Slebodnick、Stephen A. Westcott、Webster L. Santos
DOI:10.1002/anie.202006096
日期:2020.8.17
We report the first trans phosphinoboration of internal alkynes. With an organophosphine catalyst, alkynoate esters and the phosphinoboronate Ph2P‐Bpin are efficiently converted into the corresponding trans‐α‐phosphino‐β‐boryl acrylate products in moderate to good yield with high regio‐ and Z‐selectivity. This reaction operates under mild conditions and demonstrates good atom economy, requiring only
Rhodium(III)-Catalyzed Redox-Neutral Cascade [3 + 2] Annulation of <i>N</i>-Phenoxyacetamides with Propiolates via C–H Functionalization/Isomerization/Lactonization
A Rh(III)-catalyzed cascade [3 + 2] annulation of N-phenoxyacetamides with propiolates under mild conditions using the internal oxidative O–N bond as the directing group has been achieved. This catalytic system provides a regio- and stereoselective access to benzofuran-2(3H)-ones bearing exocyclic enamino motifs with exclusive Z configuration selectivity, acceptable to good yields and good functional
De Novo Construction of Substituted Terephthalates via Phosphine Catalyzed Domino Benzannulation Reactions
作者:Dan Wang、Junhui Lin、Yannan Zhu、You Huang
DOI:10.1002/adsc.202001513
日期:2021.3.29
The robustness of phosphine catalysis enabling the domino benzannulationreactions of allenoates with enamines is described. A broad array of substituted terephthalates were delivered under simple and practical reaction conditions. Furthermore, the reaction could be carried out on a gram scale with higher yield, and various conversions of the terephthalate products demonstrate the versatility of this