β-Functionalised radicals in organic synthesis: 2-acyloxyalkyl radicals from 2-acyloxyalkyl iodides by the tin route
作者:Francisco Foubelo、Francisco Lloret、Miguel Yus
DOI:10.1016/s0040-4020(01)90423-5
日期:1994.4
The reaction of iodoesters 1a-c with electrophilic olefins 2a-d and in situ generated tributyltin hydride (from a substoichiometric amount of tributyltin chloride and an excess of sodium borohydride) in the presence of a catalytic amount of AIBN in ethanol at 0 to 20°C yields the expected coupling products 3aa-3cd. Products 4 resulting from an iodine/hydrogen exchange are also obtained as by-products
Hydrophobic Pocket Occupation Design of Difluoro-Biphenyl-Diarylpyrimidines as Non-Nucleoside HIV-1 Reverse Transcriptase Inhibitors: from <i>N</i>-Alkylation to Methyl Hopping on the Pyrimidine Ring
作者:Li Ding、Christophe Pannecouque、Erik De Clercq、Chunlin Zhuang、Fen-Er Chen
DOI:10.1021/acs.jmedchem.1c00128
日期:2021.4.22
stability of the difluoro-biphenyl-diarylpyrimidine lead compound 4, a series of novel alkylated difluoro-biphenyl-diarylpyrimidines were designed and synthesized based on their structure. Introducing alkyl or substituted alkyl groups on the linker region to block the potential metabolic sensitive sites generated 22 derivatives. Among them, compound 12a with an N-methyl group displayed excellent anti-HIV-1
Reinvestigation of the conversion of epoxides into halohydrins with elemental halogen catalysed by thiourea
作者:Mirosław Soroka、Waldemar Goldeman
DOI:10.1016/j.tet.2005.02.065
日期:2005.4
In contrast to a previous literature report, thiourea is not a catalyst in the ringopening reaction of epoxides by means of bromine or iodine. Instead, thiourea reacts with the halogen to give a complex mixture of products, among them hydrogen halogenides, which are in fact the real epoxideringopening reactants. The presence of water is crucial in this reaction.
o-Phenylenediamine as a New Catalyst in the Highly Regioselective Conversion of Epoxides to Halohydrins with Elemental Halogens – A Reinvestigation
作者:Miroslaw Soroka、Waldemar Goldeman
DOI:10.1007/s00706-005-0421-9
日期:2006.2
-phenylenediamine is not a catalyst in the ringopening reaction of epoxides by means of bromine or iodine. The o -phenylenediamine is just a reactant which reacts with iodine to give phenazine-2,3-diamine and hydrogen iodide, or with bromine to give a mixture of brominated and polymerized products as well as hydrogen bromide. The hydrogen halogenides are in fact the real epoxideringopening reactants.
与先前的报告相反, 邻 苯二胺不是通过溴或碘进行环氧化物开环反应的催化剂。所述 Ô 苯二胺仅仅是一个反应物,其与碘反应,得到吩嗪-2,3-二胺和碘化氢,或用溴,得到溴化和聚合产物的混合物,以及溴化氢。卤化氢实际上是真正的环氧化物开环反应物。
Nickel-Catalyzed Regiodivergent Opening of Epoxides with Aryl Halides: Co-Catalysis Controls Regioselectivity
作者:Yang Zhao、Daniel J. Weix
DOI:10.1021/ja410704d
日期:2014.1.8
Epoxides are versatile intermediates in organic synthesis, but have rarely been employed in cross-coupling reactions. We report that bipyridine-ligated nickel can mediate the addition of functionalized arylhalides, a vinylhalide, and a vinyl triflate to epoxides under reducing conditions. For terminal epoxides, the regioselectivity of the reaction depends upon the cocatalyst employed. Iodide cocatalysis