Silver-catalyzed decarboxylative C(sp<sup>2</sup>)–C(sp<sup>3</sup>) coupling reactions <i>via</i> a radical mechanism
作者:Zhongxue Fang、Chenlong Wei、Jing Lin、Zhenhua Liu、Wei Wang、Chenshu Xu、Xuemin Wang、Yu Wang
DOI:10.1039/c7ob02455j
日期:——
A silver catalyzed decarboxylative C(sp2)–C(sp3) coupling of vinylic carboxylic acids with alcohols, alkylbenzenes, cycloalkanes and cyclic ethers was developed by using DTBP as an oxidant. This reaction tolerates a wide range of substrates, and products are obtained in good to excellent yields. The reaction also shows good stereoselectivity, and only trans-isomers are obtained. In addition, a radical
Allylic alcohols can be used directly for the palladium(0)-catalyzed allylation of aryl- and alkenylboronic acids with a wide variety of functional groups. A triphenylphosphine-ligated palladium catalyst turns out to be most effective for the cross-coupling reaction and its low loading (less than 1 mol%) leads to formation of the coupling product in high yield. The Lewis acidity of the organoboron
Palladium(0)-catalyzed direct cross-coupling reaction of allyl alcohols with aryl- and vinyl-boronic acidsElectronic supplementary information (ESI) available: spectral data of compounds. See http://www.rsc.org/suppdata/cc/b4/b402256d/
In the presence of catalytic amounts of cationic thiolate-bridged
diruthenium complexes, arenes react with allylic alcohols to afford the
corresponding allylated aromatic products in high yields.
Cross-Coupling Reactions of Alkenyl Halides with 4-Benzyl-1,4- Dihydropyridines Associated with <i>E</i>
to <i>Z</i>
Isomerization under Nickel and Photoredox Catalysis
Cross‐coupling reactions of alkenyl halides with 4‐alkyl‐1,4‐dihydropyridines as alkylation reagents have been achieved by combination of nickel and photoredox catalysts. Alkenyl halides bearing alkyl and aryl substituents are available. Particularly, in the use of aryl‐substituted alkenyl halides, cross‐coupling reactions are associated with E to Z isomerization of alkenes. Thus, Z‐isomers of the