Palladium-Catalyzed Stereo- and Regiospecific Allylation of Aryl Halides with Homoallyl Alcohols via Retro-Allylation: Selective Generation and Use of σ-Allylpalladium
Treatment of tertiary homoallylalcohol with aryl halide under palladium catalysis resulted in the transfer of the allyl moiety of the homoallylalcohol to aryl halide and yielded the corresponding cross-coupling product stereo- and regiospecifically. The transfer process includes retro-allylation, which proceeds via a conformationally regulated six-membered transition state. The retro-allylation can
An Efficient Palladium-Catalyzed Synthesis of Cinnamyl Ethers from Aromatic Halides, Phenols, and Allylic Chloride
作者:Wei Wang、Rong Zhou、Zhi-Jie Jiang、Kun Wang、Hai-Yan Fu、Xue-Li Zheng、Hua Chen、Rui-Xiang Li
DOI:10.1002/adsc.201300757
日期:2014.2.10
AbstractA one‐pot, two‐step catalytic protocol for the preparation of cinnamyl ethers from simple and readily available aryl halides, phenols and allyl chloride is reported for the first time. This simple and highly efficient palladium nanoparticles catalytic system shows good regio‐ and stereoselectivities and affords the desired products in good to high yields (49–85%) from aryl iodides. Furthermore, less reactive aryl bromides can also give the cinnamyl ethers in moderate yields (24–72%).magnified image