Synthesis of Mutual Azo Prodrugs of Anti-inflammatory Agents and Peptides Facilitated by α-Aminoisobutyric Acid
摘要:
Reported is the synthesis of azo mutual prodnigs of the nonsteroidal anti-inflammatory agents (NSAIDs) 4-aminophenylacetic acid (4-APAA) or 5-aminosalicylic acid (5-ASA) with peptides, including an antibiotic peptide temporin analogue modified at the amino terminal by an aaminoisobutyric acid (Aib) residue. These prodrugs are designed for colonic delivery of two agents to treat infection and inflammation by the bacterial pathogen Clostridium difficile.
Suzuki–Miyaura cross coupling reactions with Phenoldiazonium salts
作者:Bernd Schmidt、Frank Hölter
DOI:10.1039/c1ob05256j
日期:——
The Suzuki–Miyaura coupling of phenoldiazoniumsalts and aryl trifluoroborates yields 4-hydroxybiaryls in a protecting group-free synthesis.
铃木-宫浦的耦合 苯酚 重氮盐和芳基三氟硼酸酯可在无保护基团的合成中生成4-羟基联芳基。
Styrylsulfonates and -Sulfonamides through Pd-Catalysed Matsuda-Heck Reactions of Vinylsulfonic Acid Derivatives and Arenediazonium Salts
作者:Bernd Schmidt、Felix Wolf、Heiko Brunner
DOI:10.1002/ejoc.201600469
日期:2016.6
Arene diazonium salts undergo Matsuda–Heck reactions with vinylsulfonates and -sulfonamides to give styrylsulfonic acid derivatives in high to excellent yields and with high to excellent selectivities. By quantifying the evolution of nitrogen over time in a gas-meter apparatus, the reactivities of ethylvinylsulfonate and the benchmark olefin methyl acrylate were compared for an electron-rich and an
Alkynes and phenoldiazoniumsalts undergo a Pd‐catalyzed [2+2+1] cyclization reaction to spiro[4,5]decatetraene‐7‐ones. This structure was confirmed for one example by X‐ray single‐crystal structure analysis. The reaction is believed to proceed through oxidative addition of the phenoldiazonium cation to Pd0, subsequent insertion of two alkynes, followed by irreversible spirocyclization.
Significantly better yields were achieved in Mizoroki–Heckreactions using 4-phenoldiazoniumsalts instead of their O-alkylated analogues under otherwise identical conditions. We found that a one-flask deacetylation–diazotation–precipitation sequence starting from paracetamol or acetanilides derived thereof provides a convenient access to the required diazonium tetrafluoroborates. The utility of these
Synthesis of Mutual Azo Prodrugs of Anti-inflammatory Agents and Peptides Facilitated by α-Aminoisobutyric Acid
作者:David A. Kennedy、Nagarajan Vembu、Frank R. Fronczek、Marc Devocelle
DOI:10.1021/jo201358e
日期:2011.12.2
Reported is the synthesis of azo mutual prodnigs of the nonsteroidal anti-inflammatory agents (NSAIDs) 4-aminophenylacetic acid (4-APAA) or 5-aminosalicylic acid (5-ASA) with peptides, including an antibiotic peptide temporin analogue modified at the amino terminal by an aaminoisobutyric acid (Aib) residue. These prodrugs are designed for colonic delivery of two agents to treat infection and inflammation by the bacterial pathogen Clostridium difficile.