Palladium-Catalyzed Mizoroki–Heck Reaction of Nitroarenes and Styrene Derivatives
作者:Toshimasa Okita、Kitty K. Asahara、Kei Muto、Junichiro Yamaguchi
DOI:10.1021/acs.orglett.0c00983
日期:2020.4.17
We have developed a Mizoroki–Heck reaction of nitroarenes with alkenes under palladium catalysis. The use of a Pd/BrettPhos catalyst promoted the alkenylation, whereas other catalysts led to a decrease in the product yield. In addition to nitroarenes, nitroheteroarenes were also applicable to the present reaction. The combination of a nucleophilic aromatic substitution (SNAr) with the denitrative alkenylation
The palladium-catalyzed synthesis of unsymmetrical 1,3-diarylpropenes from allyl esters through a Mizoroki–Heck-type reaction with aryl iodides followed by allyl cross-coupling with a variety of arylboronicacids was developed; the products are obtained in moderate to good yields by using a hydrazone–Pd(OAc)2 system.
The combination of Pd(TFA)2 and KOH could efficiently catalyze the reaction of β-substituted allylic halides with arylboronic acids in water.
Pd(TFA)2和KOH的组合可以有效地催化β-取代烯丙基卤化物与芳基硼酸的反应在水中进行。
Oxidative cross-coupling of allyl(trimethyl)silanes with aryl boronic acids by palladium catalysis
作者:Zhibing Zhou、Zhen-Lin Hou、Fan Yang、Bo Yao
DOI:10.1016/j.tet.2018.10.055
日期:2018.12
allylsilanes with aryl boronic acids has been developed by palladium catalysis. The reaction between β-substituted allyl(trimethyl)silanes and a wide range of aryl boronic acids afforded allylarenes in moderate to good yields and excellent selectivity. On the basis of experimental results and literature reports, it was suggested that the reaction might start from transmetalation of aryl boronic acid with AgOAc
The coupling reaction of 1,1-disubstituted olefins (α-methylstyrene, n-butyl methacrylate) with various aryl bromides (Heck reaction) has been studied as a new concept to synthesize trisubstituted olefins. Surprisingly, the nature of the base dramatically influences the product distribution. Thus, a systematic investigation on the role of base in Heck reactions of 1,1-disubstituted olefins was performed