A Base-Induced Ring-Opening Process of 2-Substituted-1,3,4-Oxadiazoles for the Generation of Nitriles at Room Temperature
摘要:
A novel base-catalysed 1,3,4-oxadiazole fragmentation for the synthesis of nitriles at room temperature has been developed. This reaction is performed under transition-metal-free conditions, and provides a new ring cleavage reaction of 1,3,4-oxadiazoles in organic synthesis.
Pd/Cu‐catalyzed decarboxylative/directCH alkenylations of heteroarenes with α‐fluoroacrylic acid is reported. This method offers step‐economical and stereocontrolled access to valuable heteroarylated monofluoroalkenes as both Z and E isomers, which are known to be useful in the synthesis of fluorinated biomolecules.
The direct alkynylation reaction of 1,3,4-oxadiazoles with alkynyl bromides efficiently proceeds in the presence of a copper catalyst at room temperature to create the corresponding heteroaryl−alkynyl linkage in good yields. This direct coupling provides a rapid and convergent access to oxadiazole core π-conjugated systems.
Palladium-catalyzed intramolecular carbopalladation onto allenamides completed by direct C–H allylation of heterocycles is studied. The domino construction/heteroarylation of isoquinolone process is first achieved. A general three-step one-pot strategy, involving in situ generation of allenamide, π-allyl-Pd complex generation, and interception with heteroarenes, has been subsequently set up. This methodology
A general copper-catalyzed radical C(sp3)−C(sp2) cross-coupling to access 1,1-diarylalkanes under ambient conditions
作者:Xiao-Long Su、Sheng-Peng Jiang、Liu Ye、Guo-Xing Xu、Ji-Jun Chen、Qiang-Shuai Gu、Zhong-Liang Li、Xin-Yuan Liu
DOI:10.1016/j.tet.2021.132152
日期:2021.6
A general copper-catalyzedC(sp3)−C(sp2) cross-coupling of (hetero)benzyl bromides with the air- and moisture-stable aryl nucleophiles has been developed, providing a facile access to pharmaceutically useful 1,1-di(hetero)arylalkane and 1-aryl-1-heteroarylalkane scaffolds. Critical to the success is the utilization of a proline-based N,N,P-ligand to enhance the reducing capability of copper, thus easily
The simplest coupling: Copper‐mediated direct oxidative cross‐coupling of 1,3,4‐oxadiazoles and oxazoles with terminal alkynes proceeds through cleavage of sp2 CH and sp CH bonds to furnish the corresponding alkynylazoles in good yields. The reaction is tolerant toward various substitution patterns of substrates and allows the facile construction of azole‐core π‐conjugated systems.