Iron(II) and Copper(I) Control the Total Regioselectivity in the Hydrobromination of Alkenes
作者:Daniel A. Cruz、Victoria Sinka、Pedro de Armas、Hugo Sebastian Steingruber、Israel Fernández、Víctor S. Martín、Pedro O. Miranda、Juan I. Padrón
DOI:10.1021/acs.orglett.1c02186
日期:2021.8.6
A new method that allows the complete control of the regioselectivity of the hydrobrominationreaction of alkenes is described. Herein, we report a radical procedure with TMSBr and oxygen as common reagents, where the formation of the anti-Markovnikov product occurs in the presence of parts per million amounts of the Cu(I) species and the formation of the Markovnikov product occurs in the presence
Nickel-Catalyzed Sonogashira Reactions of Non-activated Secondary Alkyl Bromides and Iodides
作者:Jun Yi、Xi Lu、Yan-Yan Sun、Bin Xiao、Lei Liu
DOI:10.1002/anie.201307069
日期:2013.11.18
A nicked reaction: The title reaction of terminal alkynes with non‐activated secondaryalkyliodides and bromides was accomplished for the first time. This reaction provides a new and practical approach for the synthesis of substituted alkynes (see scheme; cod=cyclo‐1,5‐octadiene).
The SO3H-tethered imidazolium and triazolium salts, nonvolatile and recyclable Brønstedacidicionicliquids, efficiently mediate intramolecular hydroalkoxylations of alkenyl alcohols. They have been successfully employed in the synthesis of (±)-centrolobine.
SO 3 H系咪唑鎓盐和三唑鎓盐,不挥发且可回收的布朗斯台德酸性离子液体,可有效介导链烯醇的分子内加氢烷氧基化反应。它们已成功地用于合成(±)-中心洛宾。
Copper-Catalyzed Oxysulfenylation of Enolates with Sodium Sulfinates: A Strategy To Construct Sulfenylated Cyclic Ethers
A new copper-catalyzed oxysulfenylation reaction of enolates with sodium sulfinates has been disclosed. A series of sulfenylated heterocycles including four- and seven-membered cyclic ether were obtained in mild to good yields. This reaction is proposed to go through a radical process, and the sulfur radical (RS•) may be a reactive species.
Rhodium-Phosphoramidite Catalyzed Alkene Hydroacylation: Mechanism and Octaketide Natural Product Synthesis
作者:Max von Delius、Christine M. Le、Vy M. Dong
DOI:10.1021/ja305593y
日期:2012.9.12
heterogeneous base are key for high catalytic activity and linear regioselectivity. This protocol was applied in the atom- and step-economical synthesis of eight biologically active octaketide natural products, including anticancer drug candidate cytosporone B. Mechanistic studies provide insight on parameters affecting decarbonylation, a side reaction that limits the turnover number for catalytic hydroacylation