Palladium-Catalyzed meta-C–H Olefination of Arene-Tethered Diols Directed by Well-Designed Pyrimidine-Based Group
摘要:
The palladium-catalyzed meta-olefination of arene-tethered diols attached to a well-designed pyrimidine moiety is presented. Applications of the protocol are illustrated by the synthesis of various diol-based natural products, such as coumarins, phenylpropanoids, stilbenes, and chalcones. Advantages of this method are demonstrated through the easy removal of the template and a gram-scale olefination reaction. Finally, experimental verification, including H-1 NMR, ESI-MS and IR, and DFT studies are undertaken to elucidate the mechanistic complexity.
to afford 1-propenylbenzenes. The reaction shows a unique substituenteffect that is highly dependent on the distance of substituents from the allylic moiety. Thus, the reactivity of substrates bearing a methyl group is ordered in para > meta > ortho, whereas it is entirely reversed as ortho > meta > para for methoxy and chloro substituents.
cobalt-catalyzed hetero-biaryl couplingreaction between aryl chlorides and arylmagnesium halides with unprecedented selectivity has been developed. The protocol utilizes 1 mol% of cheap Co(acac)3 as pre-catalyst and effects clean reactions of deactivated chlorostyrenes with only 1.1 equiv. of the Grignard reagent under mild conditions (30 °C, 5–30 min). Highly chemoselective reactions were realized even in
[EN] PHENYL CARBAMATE COMPOUNDS FOR USE IN PREVENTING OR TREATING PEDIATRIC EPILESY AND EPILESY-RELATED SYNDROMES<br/>[FR] COMPOSÉS PHÉNYL CARMABATE DESTINÉS À L'UTILISATION DANS LA PRÉVENTION OU LE TRAITEMENT DE L'ÉPILEPSIE PÉDIATRIQUE OU DES SYNDROMES APPARENTÉS À L'ÉPILEPSIE
申请人:BIO PHARM SOLUTIONS CO LTD
公开号:WO2014142477A1
公开(公告)日:2014-09-18
The present invention provides a pharmaceutical composition for preventing and/or treating a pediatric epilepsy or epilepsy-related syndrome comprising the phenyl carbamate compound as an active ingredient, and a use of the phenyl carbamate compound for preventing and/or treating pediatric epilepsy or pediatric epilepsy-related syndromes.
[EN] METHODS FOR PRODUCING 5-(HALOMETHYL) FURFURAL<br/>[FR] PROCÉDÉS DE PRODUCTION DE 5-(HALOGÉNOMÉTHYL)FURFURAL
申请人:MICROMIDAS INC
公开号:WO2015042407A1
公开(公告)日:2015-03-26
The present disclosure provides methods to produce 5-(halomethyl)furfural, including 5- (chloromethyl)furfural, by acid-catalyzed conversion of C6 saccharides, including isomers thereof, polymers thereof, and certain derivatives thereof. The methods make use of acids with lower concentrations, and allows for conversion of sugars into 5-(halomethyl)furfural at higher temperatures and faster reaction or residence times.
Phosphazene base-promoted halogen–zinc exchange reaction of aryl iodides using diethylzinc
作者:Masahiro Ueno、Andrew E. H. Wheatley、Yoshinori Kondo
DOI:10.1039/b605807h
日期:——
The use of catalytic t-Bu-P4 base dramatically improved the performance of halogen-zinc exchange of aryl iodides, and the arylzinc derivatives were functionalized under copper-free reaction conditions.