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
Hydrophosphinylation of Unactivated Terminal Alkenes Catalyzed by Nickel Chloride
作者:Stéphanie Ortial、Henry C. Fisher、Jean-Luc Montchamp
DOI:10.1021/jo4008749
日期:2013.7.5
The room-temperature hydrophosphinylation of unactivated monosubstituted alkenes using phosphinates (ROP(O)H2) and catalytic NiCl2 in the presence of dppe is described. The method is competitive with prior palladium-catalyzed reactions and uses a much cheaper catalyst and simple conditions. The scope of the reaction is quite broad in terms of unactivated terminal olefins, proceeds at room temperature
Manganese-Catalyzed and Promoted Reactions of<i>H</i>-Phosphinate Esters
作者:Henry C. Fisher、Olivier Berger、Fabien Gelat、Jean-Luc Montchamp
DOI:10.1002/adsc.201301157
日期:2014.4.14
with alkenes and alkynes using catalytic manganese(II) acetate. Under stoichiometric conditions with manganese(III) acetate or with catalytic manganese(II) acetate+excess manganese(II) oxide various reactions like arylation or cyclization through radical oxidative arylation can take place. Whereas the chemistry of manganese is already well developed for the functionalization of H‐phosphonates, the present
Regioselective Rhodium(I)-Catalyzed Hydroarylation of Protected Allylic Amines with Arylboronic Acids
作者:Gavin Chit Tsui、Frederic Menard、Mark Lautens
DOI:10.1021/ol100974f
日期:2010.6.4
A novel regioselective rhodium(I)-catalyzed hydroarylation of unactivated alkenes with arylboronicacids is described. The catalytic system employs [Rh(COD)OH]2 and BINAP to effect the addition of various arylboronicacids to protected allylic amines. The regioselectivity was found to be highly dependent on the protecting group, favoring the linear addition product with up to 92% yield and >20:1 regioselectivity
Hydroxy Chalcogenide-Promoted Morita-Baylis-Hillman Alkylation Reaction: Intermolecular Applications with Alkyl Halides as Electrophiles
作者:Ana Gradillas、Efres Belmonte、Rondes Ferreira da Silva、Javier Pérez-Castells
DOI:10.1002/ejoc.201301743
日期:2014.3
Hydroxysulfides acted as catalysts to promote the Morita–Baylis–Hillmanalkylationreaction of cyclohexenones and dihydropyridinones. The procedure worked efficiently with a variety of halides as electrophiles. Side reactions were in competition with the MBH alkylation, but fine-tuning the reaction conditions minimized their occurence.