Pseudosaccharin amines as potent and selective KV1.5 blockers

Area of Science:

• Cardiovascular pharmacology
• Medicinal chemistry
• Ion channel research

Background:

• Phenethyl aminoheterocycles were identified as potent inhibitors of the I(Kur) current but demonstrated limited in vivo efficacy.
• The need for improved in vivo activity and selectivity for cardiac ion channels prompted further research.

Purpose of the Study:

• To design and synthesize novel pseudosaccharin amines.
• To evaluate the potency and selectivity of these compounds as K(V)1.5 channel blockers.
• To assess their in vivo pharmacodynamic activity and potential off-target effects.

Main Methods:

• Chemical synthesis of pseudosaccharin amine derivatives.
• Electrophysiological assessment of K(V)1.5 channel blockade.
• Evaluation of selectivity against other cardiac ion channels.
• In vivo pharmacodynamic and hemodynamic assessments.

Main Results:

• Compounds 14, 17d, and 21c emerged as potent K(V)1.5 channel blockers.
• These compounds exhibited significant selectivity over other cardiac ion channels.
• Potent pharmacodynamic activity was observed in vivo.
• Off-target hemodynamic effects were identified as a concern.

Conclusions:

• Pseudosaccharin amines represent a promising class of K(V)1.5 channel blockers with potential therapeutic applications.
• Further optimization is necessary to mitigate off-target hemodynamic effects and enhance the therapeutic index.