A Straightforward Synthesis of Pyrazolines and Pyrazoles: Palladium-Catalyzed Carbonylative Vinylation-Cyclocondensation Reactions of Aryl Halides
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/ejoc.201100654
日期:2011.7.19
A novel consecutive one-pot synthesis of pyrazolines and pyrazoles starting from simple arylhalides, styrenes, carbon monoxide, and hydrazines has been established. Palladium-catalyzedcarbonylative vinylation of arylhalides gave the corresponding chalcones, which are trapped in situ by addition of hydrazines.
Enantioselective Phosphine-Catalyzed Allylic Alkylations of <i>mix</i>-Indene with MBH Carbonates
作者:Junyou Zhang、Hai-Hong Wu、Junliang Zhang
DOI:10.1021/acs.orglett.7b02895
日期:2017.11.17
reported using a simple chiral sulfinamide phosphine-catalyzed asymmetric allylicalkylation of a mixture of indenes with Morita–Baylis–Hillman carbonates. The resulting derivatives can serve as a valuable synthetic building block for some drugs and natural products. Broad substrate scope and high regio- and enantioselectivity of this reaction were particularly remarkable.
Cooperation of <i>Cis</i> Vicinal Acceptors for Donor–Acceptor Cyclopropane Activation: TfOH-Promoted Ring-Opening/Aryl Shift Rearrangement to 3- and 5-Ylidenebutenolides
作者:Jiru Shao、Qinyuan Luo、Hongyan Bi、Sunewang R. Wang