Carboxylate-directed C–H allylation with allyl alcohols or ethers
作者:Xiao-Qiang Hu、Zhiyong Hu、A. Stefania Trita、Guodong Zhang、Lukas J. Gooßen
DOI:10.1039/c8sc01741g
日期:——
A [Ru(p-cymene)Cl2]2 catalyst activates allylalcohols and ethers for the regioselective ortho-C–H allylation of aromatic and heteroaromatic carboxylates. The reaction is orthogonal to most C–H functionalisations with allylalcohols in that allyl arenes rather than carbonyl compounds are obtained. A wide range of substrates are thus smoothly transformed to allylarenes at 50 °C in phosphate-buffered
Regiospecific <i>ortho</i>
-C−H Allylation of Benzoic Acids
作者:A. Stefania Trita、Agostino Biafora、Martin Pichette Drapeau、Philip Weber、Lukas J. Gooßen
DOI:10.1002/anie.201712520
日期:2018.10.26
developed and it allows the regiospecific introduction of allyl residues to benzoicacids. In the presence of a [Ru(p‐cymene)Cl2]2 and K3PO4, benzoicacids react with allyl acetates at only 50 °C to give the corresponding ortho‐allylbenzoic acids. The protocol is generally applicable to both electron‐rich and electron‐poor benzoicacids in combination with linear and branched allyl acetates. The products
已经开发出了一种羧酸盐定向的邻-CH功能基,可以将烯丙基残基的区域特异性引入苯甲酸中。在[Ru(p- cymene)Cl 2 ] 2和K 3 PO 4存在下,苯甲酸在仅50°C的条件下与乙酸烯丙酯反应,生成相应的邻-烯丙基苯甲酸。该方案通常适用于富电子和贫电子的苯甲酸与直链和支链乙酸烯丙酯的组合。可以通过双键迁移,内酯化或脱羧等方法在原位进一步对产品进行功能化。
Rhenium-catalyzed allylation of C–H bonds of benzoic and acrylic acids
作者:Yoichiro Kuninobu、Kazuhiro Ohta、Kazuhiko Takai
DOI:10.1039/c1cc12359a
日期:——
We have succeeded in the allylation of aromatic and olefinic CâH bonds of benzoic and acrylic acids using a rhenium catalyst, Re2(CO)10. In this reaction, isomerization of the introduced allyl group to the 1-propenyl group did not occur.
Manganese(I) Catalyzed ortho C–H Allylation of Benzoic Acids
作者:Jonas Felix Goebel、Johanna Stemmer、Florian Belitz、Lukas J Goossen
DOI:10.1002/anie.202301839
日期:——
A simple manganese catalyst sets new standards in the ortho-C−H allylation of benzoates, by allowing nearly complete selectivity for mono- over competing di-allylation. The reaction can be combined with an in situ decarboxylation, giving access to allylarenes in substitution patterns that are otherwise hard to obtain. The scope of the protocol is demonstrated by 44 diverse examples.
Catalytic C–N and C–H Bond Activation: <i>ortho</i>-Allylation of Benzoic Acids with Allyl Amines
作者:Xiao-Qiang Hu、Zhiyong Hu、Guodong Zhang、Nardana Sivendran、Lukas J. Gooßen
DOI:10.1021/acs.orglett.8b01762
日期:2018.7.20
A facile insertion of ruthenium into aromatic C-H and allylic C-N bonds are the key steps in a [Ru(p-cymene)Cl-2](2)-catalyzed ortho-C-H allylation of benzoic acids. This protocol allows drawing on the large pool of allylic amines for state-of-the-art ortho-functionalizations of arenes, turning neutral amines into leaving groups. Concise syntheses of biologically active compounds provide further evidence of the synthetic potential of this methodology.