Stereoselective synthesis of (E)-1-fluoro-1,3-enynes
摘要:
1-Fluoro-1,3-enynes were stereoselectively prepared by the cross-coupling reaction of 1-alkynes with beta -fluoroalkenyliodides obtained from (beta -fluoroalkenyl)iodonium salts. As the reaction proceeds under mild conditions, polyfunctionalized 1-fluoro-1,3-enynes could be prepared, and the synthesis of a fluorinated analog of a natural compound was achieved using this method. (C) 2001 Elsevier Science Ltd. All rights reserved.
Hypervalent Iodine(III)-Catalyzed Balz-Schiemann Fluorination under Mild Conditions
作者:Bo Xing、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201802466
日期:2018.7.26
An unprecedented hypervalentiodine(III) catalyzed Balz–Schiemann reaction is described. In the presence of a hypervalentiodine compound, the fluorination reaction proceeds under mild conditions (25–60 °C), and features a wide substrate scope and good functional‐group compatibility.
p-Iodotoluene difluoride reacted with 1-alkynes to give trans adducts which could be converted to 2-fluoro-1-iodoalk-1-enes without isolation.
对-碘甲苯二氟化物与1-炔反应,生成顺式加合物,不经分离即可转化为2-氟-1-碘代烯烃。
[EN] MANUFACTURE OF LACTO-N-TETRAOSE<br/>[FR] FABRICATION DE LACTO-N-TÉTRAOSE
申请人:GLYCOM AS
公开号:WO2012155916A1
公开(公告)日:2012-11-22
The present invention relates to the synthesis of the tetrasaccharide of formula (I) and novel intermediates used in the synthesis.
本发明涉及公式(I)的四糖的合成以及合成中使用的新型中间体。
Deconstructing the Catalytic, <i>Vicinal</i> Difluorination of Alkenes: HF-Free Synthesis and Structural Study of <i>p</i>-TolIF<sub>2</sub>
作者:Jérôme C. Sarie、Christian Thiehoff、Richard J. Mudd、Constantin G. Daniliuc、Gerald Kehr、Ryan Gilmour
DOI:10.1021/acs.joc.7b01671
日期:2017.11.17
an efficient synthesis of p-TolIF2 from p-TolI and Selectfluor is presented, together with a crystallographic and spectroscopic study. To mitigate safety concerns and simplify reaction execution, an HF-free protocol was devised employing CsF as a substitute fluoride source. The study provides insight into the initial I(I)→I(III) oxidation stage of the catalytic protocol using Selectfluor.
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