Polymer-supported gadolinium triflate as a convenient and efficient Lewis acid catalyst for acetylation of alcohols and phenols
作者:Hyo-Jin Yoon、Sang-Myung Lee、Jong-Ho Kim、Hong-Jun Cho、Jung-Woo Choi、Sang-Hyeup Lee、Yoon-Sik Lee
DOI:10.1016/j.tetlet.2008.03.005
日期:2008.5
(CMPS-IM-Gd) catalyst was prepared from chloromethyl polystyrene (CMPS) resin using a simple and convenient procedure. This polymeric catalyst was used as an efficient Lewisacidcatalyst for the acetylation of various alcohols and phenols with acetic anhydride, affording high yields under mild conditions. The reaction was completed in a short period of time with small amounts of the catalyst. The catalyst
Practical Solvent-Free Microwave-Assisted Hydroboration of Alkynes
作者:Julia Altarejos、David Sucunza、Juan J. Vaquero、Javier Carreras
DOI:10.1002/ejoc.202000110
日期:2020.5.29
A general method for solvent‐free hydroboration of alkynes has been developed by microwave irradiation, to get (E )‐alkenyl boronates. Several functionalizations in the C–B bond can be performed sequentially without the purification of the intermediates.
Nonlinear optical compounds and related macrostructures
申请人:University of Washington
公开号:US07601849B1
公开(公告)日:2009-10-13
Nonlinear optically active compounds, macrostructures that include nonlinear optically active components, and devices including the macrostructures. The nonlinear optically active compounds include dendrimers having two or more nonlinear optically active components. In certain embodiments, the compounds and dendrimers are crosslinkable.
Radical 1‐Fluorosulfonyl‐2‐alkynylation of Unactivated Alkenes
作者:Nils Lennart Frye、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.202115593
日期:2022.3.14
A radical transition-metal-free 1-fluorosulfonyl-2-alkynylation of unactivatedalkenes with alkynyl sulfonyl fluorides as radical traps and FSO2-radical precursors is presented. The reaction features high atom economy, broad functional group tolerance, allows the synthesis of quaternary C-centers and installs a sulfonyl fluoride moiety, which can be conveniently diversified via SuFEx click chemistry
Enantioselective Copper-Catalyzed Synthesis of Trifluoromethyl-Cyclopropylboronates
作者:Julia Altarejos、David Sucunza、Juan J. Vaquero、Javier Carreras
DOI:10.1021/acs.orglett.1c02420
日期:2021.8.6
A copper-catalyzedenantioselective cyclopropanation involving trifluorodiazoethane in the presence of alkenyl boronates has been developed. This transformation enables the preparation of 2-substituted-3-(trifluoromethyl)cyclopropylboronates with high levels of stereocontrol. The products are valuable synthetic intermediates by transformation of the boronate group. This methodology can be applied to