Syntheses and Structure–Activity Relationships in Antibacterial Activity against
<i>Clostridium difficile</i>
and XBP1 Activation Property of 13‐[(
<i>N</i>
‐Alkylamino)methyl]‐8‐oxodihydrocoptisines
synthesized to evaluate antibacterial activity against Clostridium difficile and activating x‐box‐binding protein 1 (XBP1) activity, biological properties both associated with ulcerative colitis. Improving structural stability and ameliorating biological activity were major concerns. Different substituents on the structural modification site were involved to explore the influence of diverse structures
A General, Concise Strategy that Enables Collective Total Syntheses of over 50 Protoberberine and Five Aporhoeadane Alkaloids within Four to Eight Steps
作者:Shiqiang Zhou、Rongbiao Tong
DOI:10.1002/chem.201601245
日期:2016.5.17
reported. This synthesis represents the most efficient and shortest route to date, featuring three catalytic processes: CuI‐catalyzed redox‐A3 reaction, Pd‐catalyzed reductive carbocyclization, and PtO2‐catalyzed hydrogenation. Importantly, this new strategy to the tetracyclic framework has also been applied to the collective concise syntheses of >30 natural protoberberines (without 13‐methyl group) and