Radical-chain reactions of sulfonyl azides and of ethyl azidoformate with allylstannanes: homolytic allylation at nitrogen
作者:Hai-Shan Dang、Brian P. Roberts
DOI:10.1039/p19960001493
日期:——
amounts of allyl 4-methylphenyl sulfone were also formed. The reaction follows a free-radical chain mechanism which involves competitive addition of Ph3Sn˙ to Na and to Nc of the azido group in ArSO2NaNbNc. Addition to Na followed by loss of nitrogen gives ArSO2ṄSnPh3, the precursor of the N-allylarenesulfonamide, while addition to Nc leads to the formation of ArṠO2 and thence to the allyl aryl sulfone
在2,2'-偶氮双(2-甲基丙腈)作为引发剂的存在下,4-甲基苯磺酰叠氮化物与烯丙基三苯基锡烷(ATPS)在回流的苯中反应,经过水解处理后以良好的收率得到N-烯丙基-4-甲基苯磺酰胺。也形成少量的烯丙基4-甲基苯基砜。该反应如下涉及竞争性加入pH的自由基链机构3 SN至N一个和至N ç叠氮基的在ARSO 2 Ñ一个Ñ b Ñ Ç。除了到N一个用氮气的损失给出ARSO 2 ṄSnPh 3,所述的前体Ñ-allylarenesulfonamide,而除了到N Ç导致ARFO的形成2和从此到烯丙基芳基砜。以类似的方式,以ATPS Allyltrimethylstannane的行为,但allyltributylstannane仅给出的低产率Ñ -allylarenesulfonamide和主要产物是未取代的磺酰胺的MeC 6 H ^ 4 SO 2 NH 2,其结果,因为自由基ARSO 2 ṄSnBu
Efficient synthesis of aliphatic sulfones by Mg mediated coupling reactions of sulfonyl chlorides and aliphatic halides
作者:Ying Fu、Qin-Shan Xu、Quan-Zhou Li、Zhengyin Du、Ke-Hu Wang、Danfeng Huang、Yulai Hu
DOI:10.1039/c7ob00251c
日期:——
Sulfonylchlorides were reduced to anhydrous sulfinate salts with magnesium under sonication. These sulfinates were alkylated to sulfones with alkyl chlorides in the presence of catalytic sodium iodide under sonication. A variety of aliphatic sulfones was efficiently prepared by this one-pot two-step procedure.
SO<sub>2</sub> conversion to sulfones: development and mechanistic insights of a sulfonylative Hiyama cross-coupling
作者:Aurélien Adenot、Joëlle Char、Niklas von Wolff、Guillaume Lefèvre、Lucile Anthore-Dalion、Thibault Cantat
DOI:10.1039/c9cc06858a
日期:——
A Pd-catalyzed Hiyama cross-coupling reaction using SO2 is described.
一种使用二氧化硫的Pd催化Hiyama交叉偶联反应被描述。
Hydride Affinities of Cumulated, Isolated, and Conjugated Dienes in Acetonitrile
作者:Xiao-Qing Zhu、Hao Liang、Yan Zhu、Jin-Pei Cheng
DOI:10.1021/jo801536m
日期:2008.11.7
The hydrideaffinities (defined as the enthalpy changes in this work) of 15 polarized dienes [five phenyl sulfone substituted allenes (1a), the corresponding five isolated dienes (1b), and the corresponding five conjugated dienes (1c)] in acetonitrile solution were determined by titration calorimetry for the first time. The results display that the hydrideaffinity scales of the 15 dienes in acetonitrile
A new bench stable reagent that is easily synthesized and handled is investigated for its use in radical prenylation of diverse organic molecules. It has demonstrated high functional group compatibility and can be used with numerous photocatalytic methods to give prenylated products from aryl iodides, bromides, anilines, thiols and alkyl halides.