Zwitterionic uracil derivatives as potent GnRH receptor antagonists with improved pharmaceutical properties.
A novel series of potent zwitterionic uracil GnRH antagonists were discovered that showed reduced liability for CYP3A4 enzyme inhibition.
Antiviral and Cytostatic Evaluation of 5‐(1‐Halo‐2‐sulfonylvinyl)‐ and 5‐(2‐Furyl)uracil Nucleosides
Transition metal‐catalyzed halosulfonylation of 5‐ethynyl uracil nucleosides provided (E)‐5‐(1‐chloro‐2‐tosylvinyl)uridines. Tetrabutylammonium fluoride‐mediated direct CH arylation of 5‐iodouracil nucleosides with furan or 2‐heptylfuran gave 5‐furyl‐substituted nucleosides without the necessity of using the organometallic substrates. These two classes of 5‐substituted uracil nucleosides as well their corresponding ester derivatives were tested against a broad range of DNA and RNA viruses and the human immunodeficiency virus (HIV). The 3′,5′‐di‐O‐acetyl‐5‐(E)‐(1‐chloro‐2‐tosylvinyl)‐2′‐deoxyuridine (24) inhibited the growth of L1210, CEM and HeLa cancer cells in the lower micromolar range. The (β‐chloro)vinyl sulfone 24 and 5‐(5‐heptylfur‐2‐yl)‐2′‐deoxyuridine (10) displayed micromolar activity against varicella zoster virus (VZV). The 5‐(5‐heptylfur‐2‐yl) analog 10 and its 3′,5′‐di‐O‐acetyl‐protected derivative showed similar activity against the cytomegalovirus (CMV). The 5‐(fur‐2‐yl) derivatives of 2′‐deoxyuridine and arabino‐uridine inhibited the replication of herpes simplex virus (HSV) TK+ strains while the 5‐(5‐heptylfur‐2‐yl) derivative 10 displayed antiviral activity against the parainfluenza virus.
Identification of 1-arylmethyl-3- (2-aminoethyl)-5-aryluracil as novel gonadotropin-releasing hormone receptor antagonists.
Based on SAR from bicyclic GnRH antagonists such as 6-aminomethyl-7-arylpyrrolo[1,2-a]pyrimid-4-ones (1) and 2-aryl-3-aminomethylimidazolo[1,2-a]pyrimid-5-ones (2a,b), a series of novel uracil compounds (4) were derived as the GnRH antagonists. Their syntheses and initial SAR are discussed herein. This is the first time that monocycle-based GnRH receptor antagonists are reported.