Palladium-catalyzed benzylic direct arylation of benzyl sulfones with aryl halides
摘要:
An effective palladium catalyst system for the direct arylation of benzyl sulfones with aryl halides has been developed. The catalytic reaction provides a facile route to diarylmethyl sulfones. The products can be transformed further via desulfonylative functionalization mediated by aluminum compounds. (C) 2009 Elsevier Ltd. All rights reserved.
Nickel-Catalyzed Kumada Reaction of Tosylalkanes with Grignard Reagents to Produce Alkenes and Modified Arylketones
作者:Ji-Cheng Wu、Lu-Bing Gong、Yuanzhi Xia、Ren-Jie Song、Ye-Xiang Xie、Jin-Heng Li
DOI:10.1002/anie.201205969
日期:2012.9.24
Open a new door: The first example of alkene synthesis from alkyl electrophiles with Grignard reagents using the Kumada cross‐coupling reaction strategy is reported. This method opens a new door for the Kumada cross‐coupling reaction, allowing alkenes to be prepared from the reaction of tosylalkanes with Grignard reagents.
An efficient method for the synthesis of sulfones via nitrogen loss of sulfonyl hydrazones is described. The reaction was performed in the presence of simple copper salt and base by utilization of sulfonyl hydrazones, which were easily prepared from carbonyl compounds. A wide variety of aryl and alkyl sulfones were obtained in moderate to good yields.
Substrate- and temperature-controlled divergence in reactions of alcohols with TosMIC catalyzed by BF<sub>3</sub> · Et<sub>2</sub>O: Facile access to sulfinates and sulfones
ABSTRACT An efficient BF3 · Et2O-catalyzed divergent synthesis of sulfinate esters and sulfones through C–O and C–S bond formation has been achieved from alcohols and p-toluenesulfonylmethyl isocyanide (TosMIC). Various alcohols reacted smoothly with TosMIC under the present conditions at room temperature providing sulfinate esters exclusively. By tuning the reaction temperature, the alcohols that
A new protocol for the directsulfonylation of benzylic, allylic and homoallylic alcohols with sodiumarenesulfinates is described by using iron(III) chloride as a catalyst and chlorotrimethylsilane as an additive. This method requires no preactivation of alcohols. Surprisingly in the reaction with homoallyl alcohols nucleophilic addition of sulfinate anion, occurs at the terminal double bond instead