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
A novel palladium-catalyzed, one-pot, four-step cascademethod has been developed to afford functionalized gamma-lactones in moderate to good yields. This novel and general methodology represents a rare instance of carbonylation of the C(sp(3))-palladium bond.
A novel iodine-catalyzed method for the synthesis of benzothiophene derivatives through cascadereactions of substituted thiophenols with alkynes has been demonstrated under metal- and solvent-freeconditions. The present protocol uses inexpensive and environmentally friendly molecular iodine as the catalyst, and the corresponding products are obtained in moderate to excellent yields. Such an efficient
Gold‐Catalyzed [4+2] Annulation/Cyclization Cascades of Benzisoxazoles with Propiolate Derivatives to Access Highly Oxygenated Tetrahydroquinolines
作者:Rajkumar Lalji Sahani、Rai‐Shung Liu
DOI:10.1002/anie.201707423
日期:2017.10.2
Tag team: This work describes gold-catalyzed [4+2] annulation/cyclizationcascades of electron-deficient alkynes with benzisoxazoles to yield quinoline oxides chemoselectively. With the same reactants, a new relay catalysis using gold and zinc(II) catalysts afford highly oxygenated tetrahydroquinoline derivatives stereoselectively. Tf=trifluoromethanesulfonyl.