Construction of 2-Substituted-3-Functionalized Benzofurans via Intramolecular Heck Coupling: Application to Enantioselective Total Synthesis of Daphnodorin B
A novel approach was developed for the synthesis of 2-substituted-3-functionalized benzofurans, using an intramolecular Heckreaction which was further applied in the first enantioselectivetotalsynthesis of Daphnodorin B.
A phosphine-free, atom-efficient cross-coupling reaction of triorganoindiums with acyl chlorides catalyzed by immobilization of palladium(0) in MCM-41
作者:Jiankang Miao、Bin Huang、Haiyi Liu、Mingzhong Cai
DOI:10.1039/c7ra08355f
日期:——
first phosphine-free heterogeneous palladium(0)-catalyzedcross-coupling of triorganoindiums with acyl chlorides has been developed that proceeds smoothly in THF at 68 °C and provides a general and powerful tool for the synthesis of various valuable aryl ketones and α,β-acetylenic ketones with high atom-economy and high yield. This phosphine-free heterogeneous palladium(0) catalyst can be easily prepared
Thermal 1,3-dipolar cycloaddition of azomethine imines with alkynes affording N,N-bicyclic pyrazolidinones under microwave irradiation
作者:Zhi-Wei Yang、Jing-Fang Wang、Li-Jie Peng、Xiao-Lin You、Hai-Lei Cui
DOI:10.1016/j.tetlet.2016.10.030
日期:2016.11
A metal and catalyst free 1,3-dipolar cycloaddition reaction of azomethineimines with internal alkynes has been developed. Various N,N-bicyclic pyrazolidinones could be prepared quickly under microwave irradiation in moderate to excellent yields (up to 96%). A wide range of azomethineimines and electron-deficient internal alkynes were applicable to this reaction. In addition, gram-scale reaction
An efficient synthesis of 2,5-disubstitutedfurans directly from alkynyl ketones has been developed via tandem gold(I)-catalyzed isomerization of alkynyl ketones to allenyl ketones and cycloisomerization. The key to the success of this chemistry is the use of a biphenyl-2-ylphosphine ligand featuring a critical remote tertiary amino group.
An efficient and operationally simple procedure using Pd/BaSO4-catalyzed cross coupling of acyl chlorides with in situ generated alkynylzinc derivatives was developed, giving the corresponding ynones at yields of 50%–96%.