2,4-Diamino-5-benzylpyrimidines and analogs as antibacterial agents. 9. Lipophilic trimethoprim analogs as antigonococcal agents
摘要:
Lipophilic analogues of trimethoprim (1) bearing 3,5-dialkyl-4-hydroxy substituents in the benzene ring are much more active in vitro against Neisseria gonorrhoeae than is 1. The 3,5-diisopropyl-4-hydroxy derivative (2) was selected as a candidate for clinical evaluation as an antigonococcal agent, and as part of the preliminary evaluation it was submitted to extended pharmacokinetic and metabolism studies in dogs. Although the compound was not extensively conjugated by metabolic enzymes, one of the methyl groups was metabolized to produce a 3-isopropyl-4-hydroxy-5-(alpha-carboxyethyl)benzyl derivative (43), which was rapidly excreted. Related analogues were likewise extensively metabolized.
2,4-Diamino-5-benzylpyrimidines and analogs as antibacterial agents. 2. C-Alkylation of pyrimidines with Mannich bases and application to the synthesis of trimethoprim and analogs
作者:Barbara Roth、Justina Z. Strelitz、Barbara S. Rauckman
DOI:10.1021/jm00178a007
日期:1980.4
A new route to 5-(p-hydroxybenzyl)pyrimidines has been developed which utilizes phenolic Mannich bases plus pyrimidines containing at least two activating groups. The products can be alkylated on the phenolic oxygen or on the pyrimidine N-1 atom, depending on conditions. This method has been used to prepare trimethoprim, a broad-spectrum antibacterial agent, starting from 2,4-diaminopyrimidine and