A Palladium-Catalyzed Carbonylation Approach to Acid Chloride Synthesis
摘要:
We describe a new approach to acid chloride synthesis via the palladium-catalyzed carbonylation of aryl iodides. The combination of sterically encumbered phosphines ((PBu3)-Bu-t) and CO coordination has been found to facilitate the rapid carbonylation of aryl iodides into acid chlorides via reductive elimination from ((Bu3P)-Bu-t)(CO)Pd(COAr)Cl. The formation of acid chlorides can also be exploited to perform traditional aminocarbonylation reactions under exceptionally mild conditions (ambient temperature and pressure), and with a range of weakly nucleophilic substrates.
Room-Temperature Decarboxylative Couplings of α-Oxocarboxylates with Aryl Halides by Merging Photoredox with Palladium Catalysis
作者:Wan-Min Cheng、Rui Shang、Hai-Zhu Yu、Yao Fu
DOI:10.1002/chem.201502286
日期:2015.9.14
Enabled by merging iridium photoredoxcatalysis and palladiumcatalysis, α‐oxocarboxylate salts can be decarboxylatively coupled with arylhalides to generate aromatic ketones and amides at room temperature. DFT calculations suggest that this reaction proceeds through a Pd0–PdII–PdIII pathway, in which the PdIII intermediate is responsible for reoxidizing IrII to complete the IrIII–*IrIII–IrII photoredox
通过合并铱的光氧化还原催化和钯催化,α-氧代羧酸盐可以与芳基卤化物脱羧偶联,在室温下生成芳族酮和酰胺。DFT计算表明,该反应通过Pd 0 -Pd II -Pd III途径进行,其中Pd III中间体负责重新氧化Ir II以完成Ir III- * Ir III -Ir II光氧化还原循环。
A General and Efficient CuBr<sub>2</sub>-Catalyzed<i>N</i>-Arylation of Secondary Acyclic Amides
A general and efficient Cu(II)‐catalyzed cross‐coupling method is reported for the preparation of acyclic tertiary amides. Generally moderate to excellent yields and functional group tolerance were obtained with secondaryacyclicamides and aryl halides as substrates in toluene.
Rearrangement of nitrones to amides using chlor0sulfonyl isocyanate
作者:Sajan P. Joseph、D.N. Dhar
DOI:10.1016/s0040-4020(01)96081-8
日期:1986.1
Reaction of chlorosulfonyl isocyanate (CSI) with nitrones a-n and a,b has been studied. α, α, N-Triaryl nitrones a-n react with CSI to form the N,N-diaryl arylamides a-n and i-n in good yields. In the case of α-H, α, N-diaryl nitrones a,b however, two compounds viz., the rearranged product a,b and the 1,4-dihydro tetrazines a,b are formed.
Bis (aminostyryl) benzene compunds and synthetic intermediates thereof, and process for preparing the compounds and intermediates
申请人:——
公开号:US20030069437A1
公开(公告)日:2003-04-10
A bis(aminostyryl)benzene compound of the following general formula [I] is provided
1
wherein R
2
and R
3
independently represent an unsubstituted aryl group, and R
1
and R
4
independently represent an aryl group, and R
5
to R
8
independently represent a cyano group or the like. A process for the preparation thereof is described wherein a 4-(N,N-diarylamino)benzaldehyde and a diphosphonic acid ester or diphosphonium salt are, for example, subjected to condensation reaction. Intermediates of the bis(aminostyryl)benzene compound are also described.
Amides can be converted into gem-difluoroalkenes. The reaction involves interaction of α-chloroiminium salts with difluorinated phosphorus ylide formed from difluorocarbene and triphenylphosphine.