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J Med Chem. 2007 Jun 28;50(13):3046-53. Epub 2007 Jun 7.

Design and synthesis of classical and nonclassical 6-arylthio-2,4-diamino-5-ethylpyrrolo[2,3-d]pyrimidines as antifolates.

Author information

1
Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282, USA. gangjee@duq.edu

Abstract

The classical antifolate N-{4-[(2,4-diamino-5-ethyl-7H-pyrrolo[2,3-d]pyrimidin-6-yl)sulfanyl]benzoyl}-l-glutamic acid (2) and 15 nonclassical analogues (3-17) were synthesized as potential dihydrofolate reductase (DHFR) inhibitors and as antitumor agents. 5-Ethyl-7H-pyrrolo[2,3-d]pyrimidine-2,4-diamine (20) served as the key intermediate to which various aryl thiols and a heteroaryl thiol were appended at the 6-position via an oxidative addition reaction. The classical analogue 2 was synthesized by coupling the benzoic acid derivative 18 with diethyl l-glutamate followed by saponification. The classical compound 2 was an excellent inhibitor of human DHFR (IC50 = 66 nM) as well as a two digit nanomolar (<100 nM) inhibitor of the growth of several tumor cells in culture. Some of the nonclassical analogues were potent and selective inhibitors of DHFR from two pathogens (Toxoplasma gondii and Mycobacterium avium) that cause opportunistic infections in patients with compromised immune systems.

PMID:
17552508
PMCID:
PMC3850752
DOI:
10.1021/jm070165j
[Indexed for MEDLINE]
Free PMC Article

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