Lewis acid-assisted palladium-catalysed dealkoxylation of N-alkoxyamides has been realised in the absence of an external reductant.
Lewis酸辅助钯催化的N-烷氧基酰胺脱烷氧化反应在无外部还原剂的情况下实现。
Compounds and compositions for use in the prevention and treatment of obesity and related syndromes
申请人:Chapal Nicolas
公开号:US20060223884A1
公开(公告)日:2006-10-05
The invention relates to 4-hydroxyisoleucine, isomers, analogs, lactones, salts, and prodrugs thereof, to processes for their preparation, and to pharmaceutical compositions comprising the same. More particularly, the invention relates to the use of those compounds in the prevention and treatment of obesity and related syndromes.
The selective addition of organomagnesium reagents to 2,4,6‐trichlorophenyl isocyanide leading to magnesiated aldimines is reported. These aldimines react with Weinreb amides, ketones, or carbonates to provide the corresponding carbonyl derivatives after acidic cleavage. This allows for an efficient synthesis of 1,2‐dicarbonyl compounds and α‐hydroxy ketones.
The extraordinary reactions of phenyldimethylsilyllithium with N,N-disubstituted amides
作者:Marina Buswell、Ian Fleming、Usha Ghosh、Stephen Mack、Matthew Russell、Barry P. Clark
DOI:10.1039/b412768d
日期:——
the text. Notably, each member of the homologous series of amides Ph(CH2)nCONMe2 gives rise to a substantially different product: when n= 0, the reaction is normal, and the yield of the alph]-silylamine 20e is high; when n=1, proton transfer in the intermediate anion 64 and displacement of the phenyl group leads to the silaindane 66; when n=2, fragmentation of the intermediate anion 80, and capture
One-Pot Transition-Metal-Free Synthesis of Weinreb Amides Directly from Carboxylic Acids
作者:Danfeng Huang、Yulai Hu、Teng Niu、Ke-Hu Wang、Changming Xu、Yingpeng Su、Ying Fu
DOI:10.1055/s-0033-1340317
日期:——
directly fromcarboxylicacids, N,O-dimethylhydroxylamine, and phosphorus trichloride in one pot at 60 °C in toluene in high yields, thus avoiding the separation of the moisture and air sensitive intermediate P[NMe(OMe)]3 in advance. Sterically hindered carboxylicacids also give the corresponding Weinreb amides in excellent yields. Various functional groups are tolerated on the carboxylicacid. The method