Selective C−S Bond Formation via Fe-Catalyzed Allylic Substitution
作者:Markus Jegelka、Bernd Plietker
DOI:10.1021/ol901297s
日期:2009.8.6
In contrast to the formation of C−O and C−N bonds it was only recently that the selective C−Sbondformation by means of transition metal complexes moved more into the center of research. This is somewhat surprising given the fact that the sulfur atom in a functional group can possess different oxygenation levels which correspond to different chemical properties and reaction portfolios. Herein we wish
thermodynamically-stable isomers is negligible. On the other hand, the palladium-catalyzed sulfonylation of allylic acetates with sodium benzenesulfinate is accompanied by the isomerization to give the thermodynamically-controlled products selectively. These results can be explained by assuming that allylic nitro compounds are more reactive to the palladium catalyst than allylic acetates and sulfones.
Nucleophilic substitution reactions of allylic esters catalysed by palladium-graphite and related heterogeneous catalysts
作者:Gian Paolo Boldrini、Diego Savoia、Emilio Tagliavini、Claudio Trombini、Achille Umani-Ronchi
DOI:10.1016/0022-328x(84)85102-5
日期:1984.6
Highly dispersed palladium on graphite (Pd/Gr), carbon (Pd/C) and alumina (Pd/Al2O3) have been employed as catalysts in substitutionreactions of allylic esters with nucleophiles such as benzenesulfinate and diethyl malonate anions, and 1-(1-cyclohexen-1-yl)pyrrolidine.
高度分散的钯/石墨(Pd / Gr),碳(Pd / C)和氧化铝(Pd / Al 2 O 3)已用作烯丙基酯与亲核试剂(如苯亚磺酸盐和丙二酸二乙酯)的取代反应中的催化剂, -(1-环己烯-1-基)吡咯烷。
Regioselective synthesis of allylic sulfones by palladium-catalyzed denitro-sulfonylation of allylic nitro compounds
作者:Rui Tamura、Koji Hayashi、Masato Kakihana、Masanori Tsuji、Daihei Oda
DOI:10.1016/s0040-4039(00)61946-9
日期:1985.1
Allylicnitrocompounds undergo denitro-sulfonylation catalyzed by Pd(PPh3)4 or Pd(PPh3)4 +NaNO2 with PhSO2Na·2H2O to afford allylic sulfones regioselectively.
π-Allylic Sulfonylation in Water with Amphiphilic Resin-Supported Palladium-Phosphine Complexes
作者:Yasuhiro Uozumi、Toshimasa Suzuka
DOI:10.1055/s-2008-1067096
日期:——
with an amphiphilic polystyrene-poly(ethylene glycol) (PS-PEG) resin-supported phosphine-palladium complex in water as a single reaction medium under heterogeneous conditions to give allyl sulfones in good to high yields. Catalyticasymmetricallylic substitution of cycloalkenyl esters also took place in water using a PS-PEG resin-supported chiral imidazo-indolephosphine-palladium complex to give cycloalkenyl
用两亲性聚苯乙烯-聚(乙二醇)(PS-PEG)树脂负载的膦-钯配合物在水中作为单一反应介质在非均相条件下进行烯丙基酯与芳基亚磺酸钠的 π-烯丙基取代,得到良好的烯丙基砜到高产。环烯基酯的催化不对称烯丙基取代也在水中使用 PS-PEG树脂负载的手性咪唑-吲哚膦-钯络合物进行,得到高达 81% ee 的环烯基砜。