Novel pyrazolo[3,4-d]pyrimidine-based inhibitors of Staphlococcus aureus DNA polymerase III: design, synthesis, and biological evaluation.
6-Anilinopyrazolo[3,4-d]pyrimidin-4-ones are novel dGTP analogues that inhibit the replication-specific enzyme DNA polymerase III (DNA pol III) of Staphlococcus aureus and other Gram-positive (Gr+) bacteria. To enhance the potential of these inhibitors as antimicrobial agents, a structure-activity relationship was developed involving substitutions at the 2, 4, and pyrazolo NH positions. All of the new inhibitors were tested for their ability to inhibit S. aureus DNA pol III and the growth of several other Gr+ bacteria in culture. 2-Anilino groups with small hydrophobic groups in the meta or para position enhanced both antipolymerase and antimicrobial activity. 2-Benzyl-substituted inhibitors were substantially less active. Substitution in the 4-position by oxygen gave the optimal activity, whereas substitution at the pyrazolo NH was not tolerated. These pyrazolo[3,4-d]pyrimidine derivatives represent a novel class of antimicrobials with promising activities against Gr+ bacteria.
Department of Medicinal Chemistry, Merck Research Laboratories, P.O. Box 2000, Rahway, New Jersey 07065, USA. amjad_ali@merck.com
Amjad
A
Ali
Gayle E
GE
Taylor
Ken
K
Ellsworth
Georgianna
G
Harris
Ronald
R
Painter
Lynn L
LL
Silver
Katherine
K
Young
D000814:Aniline Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D001412:Bacillus subtilis / Q000187:drug effects; D004258:DNA Polymerase III / Q000037:antagonists & inhibitors*; D015195:Drug Design; D016984:Enterococcus faecium / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects / Q000201:enzymology*; D013296:Streptococcus pneumoniae / Q000187:drug effects; D013329:Structure-Activity Relationship
D000814:Aniline Compounds; D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D011720:Pyrazoles; D011743:Pyrimidines; D004258:DNA Polymerase III