title: Non-glutamate type pyrrolo[2,3-d]pyrimidine antifolates. I: Synthesis and biological properties of pyrrolo[2,3-d]pyrimidine antifolates containing tetrazole congener of glutamic acid.
abstract: Either the alpha- or gamma-carboxyl group of the glutamic acid moiety of N-[4-[3-(2,4-diamino-7H-pyrrolo[2,3-d]pyrimidin-5- yl)propyl]benzoyl]-L-glutamic acid (1b, TNP-351) and its related compound (1a) was replaced with a 1H-tetrazole ring, and the inhibitory effects of the resulting compounds on dihydrofolate reductase (DHFR) and the growth of murine fibrosarcoma Meth A cells were examined. The gamma-tetrazole analogs (2) were found to be much more potent DHFR inhibitors than TNP-351, and strongly inhibited the growth of Meth A cells. On the other hand, the alpha-tetrazole analogs (3) were much less active against Meth A cells, even though their DHFR-inhibitory activity was comparable to that of TNP-351. These findings suggest that the alpha-carboxyl group plays an important role in effective uptake via the reduced folate carrier, and a novel DHFR inhibitor could be obtained by chemically modifying the gamma-carboxyl moiety while leaving the alpha-carboxyl group intact.
authors.affiliation: Pharmaceutical Research Laboratories III, Takeda Chemical Industries, Ltd., Osaka, Japan.
authors.forename: F
authors.initials: F
authors.lastname: Itoh
authors.forename: K
authors.initials: K
authors.lastname: Yukishige
authors.forename: M
authors.initials: M
authors.lastname: Wajima
authors.forename: K
authors.initials: K
authors.lastname: Ootsu
authors.forename: H
authors.initials: H
authors.lastname: Akimoto
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D005354:Fibrosarcoma / Q000473:pathology; D005493:Folic Acid Antagonists / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D018698:Glutamic Acid / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008727:Methotrexate / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D051379:Mice; D013329:Structure-Activity Relationship; D013777:Tetrazoles / Q000737:chemistry; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D005493:Folic Acid Antagonists; D013777:Tetrazoles; C078101:TNP 351; D018698:Glutamic Acid; D008727:Methotrexate