的甲基substituiertem的酸催化二烯醇-苯重排ø -和p -propargylcyclohexadienols(18-22,34和35,其考察)。在第一步骤中的水被消除,得到相应的甲基炔丙基benzonium离子(参见方案6,一个),其经历[1级小号,2个小号]σ迁移重排,得到propargylbenzenes(28,29,30,38)和[3小号,4小号]σ迁移重排,得到allenylbenzenes(24-27,40)(参见方案2,3,5,6)。[3s,3 s ]σ重排仅在很小的范围内发生。在2-炔丙基-2,4,6-三甲基环己-3,5-二烯-1-醇(18)的重排中,观察到[1 s,2 s ]σ甲基位移(4%)。
A palladium-catalyzedoxidativeallylation of bis[(pinacolato)boryl]methane to afford the corresponding homoallylic organoboronic esters with moderate to excellent yields is reported. This novel transformation provides an efficient strategy for the construction of homoallylic organoboronic esters in one step with a broad substrate scope. It is proposed that the palladium-catalyzedoxidative allylic
Selective formation of non-conjugated olefins by samarium(II)-mediated elimination/isomerization of allylic benzoates
作者:Sara L. Schaefer、Connor L. Roberts、Erasmus O. Volz、Monika R. Grasso、Gregory W. O’Neil
DOI:10.1016/j.tetlet.2013.08.136
日期:2013.11
Aromatic allylic benzoates can be selectively transformed to the corresponding benzoate eliminatedolefin by the action of samarium diiodide. Depending on the substrate and the elimination conditions, high selectivity for the non-conjugated alkene product can be achieved.
Electrochemical Vicinal Difluorination of Alkenes: Scalable and Amenable to Electron‐Rich Substrates
作者:Sayad Doobary、Alexi T. Sedikides、Henry P. Caldora、Darren L. Poole、Alastair J. J. Lennox
DOI:10.1002/anie.201912119
日期:2020.1.13
oxidative difluorination of alkenes represents an important strategy for their preparation, yet current methods are limited in their alkene-types and tolerance of electron-rich, readily oxidized functionalities, as well as in their safety and scalability. Herein, we report a method for the difluorination of a number of unactivated alkene-types that is tolerant of electron-rich functionality, giving products
The allylation of electron-rich arenes with allyl tosylate proceeded at 0 °C in the presence of [Rh(nbd)(CH3CN)2]PF6. Various oxygenated arenes were allylated with high para-selectivity in almost all cases. Especially in the reaction of anisoles, the tendency was remarkable.
Pd-Catalyzed Regioselective Branched Hydrocarboxylation of Terminal Olefins with Formic Acid
作者:Wenlong Ren、Mingzhou Wang、Jianqiong Guo、Jintao Zhou、Jianxiao Chu、Yuan Shi、Yian Shi
DOI:10.1021/acs.orglett.1c04231
日期:2022.1.28
A regioselectivePd-catalyzed hydrocarboxylation of terminal olefins with HCOOH is described. A wide variety of branched carboxylic acids can readily be obtained with high regioselectivities under mild reaction conditions. The reaction is operationally simple and requires no handling of toxic CO. The ligand and LiCl are important factors for reaction reactivity and selectivity.