An anionic iron complex catalyzes the decarboxylative allylation of phenols to form allylic ethers in high yield. The allylation is regioselective rather than regiospecific. This suggests that the allylation proceeds through π-allyl iron intermediates in contrast to related allylations of carbon nucleophiles that have been proposed to proceed via σ-allyl complexes. Ultimately, iron catalysts have the
作者:Basker Sundararaju、Mathieu Achard、Bernard Demerseman、Loic Toupet、Gangavaram V. M. Sharma、Christian Bruneau
DOI:10.1002/anie.200907034
日期:2010.4.1
Branching out: A new ruthenium(IV) complex (1), containing a P,O‐chelating ligand, is an efficient precatalyst for regioselective allylations starting from various allylicalcohol derivatives.
A cross-coupling reaction of allylic aryl ethers with arylmagnesium reagents was investigated using β-aminoketonato- and β-diketiminato-based pincer-type nickel(II) complexes as catalysts. An β-aminoketonato nickel(II) complex bearing a diphenylphosphino group as a third donor effectively catalyzed the reaction to afford the target cross-coupled products, allylbenzene derivatives, in high yield. The
使用基于β-氨基酮基和β-二酮亚基的钳型镍(II)配合物作为催化剂,研究了烯丙基芳基醚与芳基镁试剂的交叉偶联反应。带有二苯基膦基作为第三供体的 β-氨基酮基镍 (II) 配合物有效地催化了反应,以高产率提供了目标交叉偶联产物烯丙基苯衍生物。各种取代的肉桂基醚的区域选择性反应得到相应的线性产物。相反,α-和γ-烷基取代的烯丙基醚提供线性和支化产物的混合物。这些结果表明偶联反应是通过 π-烯丙基镍中间体进行的。
Pd-Catalyzed Substitution of the OH Group of Nonderivatized Allylic Alcohols by Phenols
作者:Thanya Rukkijakan、Sunisa Akkarasamiyo、Supaporn Sawadjoon、Joseph S. M. Samec
DOI:10.1021/acs.joc.7b03274
日期:2018.4.6
Nonactivated phenols have been employed as nucleophiles in the allylation of nonderivatized allylic alcohols to generate allylated phenolic ethers with water as the only byproduct. A Pd[BiPhePhos] catalyst was found to be reactive to give the O-allylated phenols in good to excellent yields in the presence of molecular sieves. The reactions are chemoselective in which the kinetically favored O-allylated
The utility of hydroxylamines as nitrogen nucleophiles was investigated in the iridium-catalyzed regio- and enantioselective allylic substitution. Allylic substitution with hydroxylamines proceeded with good enantioselectivities by using the iridium-complex of bis(oxazolinyl)pyridine ligand. The good regio- and enantioselectivities were also achieved in the reaction with alkylamines, p-anisidine, and 4-methoxyphenol.