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