Selective Mono- and Dialkynylation of 1-Fluoro-2,2-diiodovinylarenes Using Pd-Catalyzed Decarboxylative Coupling Reactions
作者:Aravindan Jayaraman、Sunwoo Lee
DOI:10.1021/acs.orglett.9b02907
日期:2019.10.4
Palladium-catalyzed decarboxylative coupling reactions using alkynoic acids and 1-fluoro-2,2-diiodovinylarenes provide mono- and dialkynylfluoroalkenes with high selectivity. When the reaction was conducted using DBU/DMSO, the hydrodeiodinated monoalkynylfluoroalkene product was formed, whereas performing the reaction using Et3N/THF gave the dialkynylfluoroalkene product. Both reaction conditions gave high yields of
使用炔酸和1-氟-2,2-二碘乙烯基芳烃的钯催化的脱羧偶联反应可提供高选择性的单-和二-炔基氟烯烃。当使用DBU / DMSO进行反应时,形成了加氢碘化的单炔基氟代烯烃产物,而使用Et 3 N / THF进行反应则得到了二炔基氟代烯烃产物。两种反应条件均产生了高产率的带有氟原子的所需烯炔和乙炔产物。
Expedient Synthesis of 1,1-Diiodoalkenes
作者:Béatrice Bonnet、Yann Le Gallic、Gérard Plé、Lucette Duhamel
DOI:10.1055/s-1993-25999
日期:——
1,1-Diiodoalkenes 1 were readily prepared from carbonyl compounds 2 and diethyl diiodomethylphosphonate (3), generated in situ from commercial diethyl iodomethylphosphonate (4) or diethyl methylphosphonate (5). Starting from aldehydes, iodoacetylenes 6 could be obtained directly in situ by dehydrohalogenation of diiodoalkenes 1.
One-pot synthesis of telluroketene acetals and haloketene acetals using sp2 geminated hetero organobismetallic intermediates
作者:Palimécio G. Guerrero、Paulo R. de Oliveira、Adriano C.M. Baroni、Francisco A. Marques、Ricardo Labes、Miguel J. Dabdoub
DOI:10.1016/j.tetlet.2012.01.065
日期:2012.3
A novel one-pot synthesis of 1,1-dihalo-1-alkenes and 1,1-bis(butyltelluro)-1-alkenes was developed from hydrozirconation of alkynylzinc bromide with Cp2Zr(H)Cl and subsequent capture of the Zn/Zr 1,1-heterodimetallo-1-alkene intermediates with halogen and tellurium electrophiles. These protocols, which include multiple reactions in a one-pot procedure, allow the preparation of the potentially useful
Zinc/Indium Bimetallic Lewis Acid Relay Catalysis for Dehydrogenative Silylation/Hydrosilylation Reaction of Terminal Alkynes with Bis(hydrosilane)s
作者:Tomohiro Tani、Yudai Sohma、Teruhisa Tsuchimoto
DOI:10.1002/adsc.202000501
日期:2020.10.6
with two different Lewisacid catalysts of zinc and indium, terminal alkynes were found to react with bis(hydrosilane)s to selectively provide 1,1‐disilylalkenes from among several possible products, by way of a sequential dehydrogenative silylation/intramolecular hydrosilylation reaction. Adding a pyridine base is crucial in this reaction; a switch as a catalyst of the zinc Lewisacid is turned on by
1‐Alkynyltriazenes as Functional Analogues of Ynamides
作者:Florian G. Perrin、Gregor Kiefer、Loïc Jeanbourquin、Sophie Racine、Daniele Perrotta、Jérôme Waser、Rosario Scopelliti、Kay Severin
DOI:10.1002/anie.201507033
日期:2015.11.2
The chemical reactivity of 1‐alkynyltriazenes has been investigated and is found to parallel the reactivity of ynamides. The similarity in reactivity of these two classes of compounds is demonstrated by addition reactions with acids, by cycloaddition reactions with ketenes, tetracyanoethene, and cyclopropanes, as well as by intramolecular cyclization reactions. The presence of reactive triazene groups