title: Design, synthesis, and X-ray crystal structures of 2,4-diaminofuro[2,3-d]pyrimidines as multireceptor tyrosine kinase and dihydrofolate reductase inhibitors.
abstract: To optimize dual receptor tyrosine kinase (RTK) and dihydrofolate reductase (DHFR) inhibition, the E- and Z-isomers of 5-[2-(2-methoxyphenyl)prop-1-en-1-yl]furo[2,3-d]pyrimidine-2,4-diamines (1a and 1b) were separated by HPLC and the X-ray crystal structures (2.0 and 1.4A, respectively) with mouse DHFR and NADPH as well as 1b with human DHFR (1.5A) were determined. The E- and Z-isomers adopt different binding modes when bound to mouse DHFR. A series of 2,4-diaminofuro[2,3-d]pyrimidines 2-13 were designed and synthesized using the X-ray crystal structures of 1a and 1b with DHFR to increase their DHFR inhibitory activity. Wittig reactions of appropriate 2-methoxyphenyl ketones with 2,4-diamino-6-chloromethyl furo[2,3-d]pyrimidine afforded the C8-C9 unsaturated compounds 2-7 and catalytic reduction gave the saturated 8-13. Homologation of the C9-methyl analog maintains DHFR inhibitory activity. In addition, inhibition of EGFR and PDGFR-beta were discovered for saturated C9-homologated analogs 9 and 10 that were absent in the saturated C9-methyl analogs.
authors.affiliation: Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA 15282, USA. gangjee@duq.edu
authors.forename: Aleem
authors.initials: A
authors.lastname: Gangjee
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Lin
authors.forename: Yibin
authors.initials: Y
authors.lastname: Zeng
authors.forename: Michael
authors.initials: M
authors.lastname: Ihnat
authors.forename: Linda A
authors.initials: LA
authors.lastname: Warnke
authors.forename: Dixy W
authors.initials: DW
authors.lastname: Green
authors.forename: Vivian
authors.initials: V
authors.lastname: Cody
authors.forename: Jim
authors.initials: J
authors.lastname: Pace
authors.forename: Sherry F
authors.initials: SF
authors.lastname: Queener
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D018360:Crystallography, X-Ray; D015195:Drug Design; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D015394:Molecular Structure; D011743:Pyrimidines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D051381:Rats; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors*; D013762:Tetrahydrofolate Dehydrogenase / Q000187:drug effects*
chemical_list: D004791:Enzyme Inhibitors; D011743:Pyrimidines; D013762:Tetrahydrofolate Dehydrogenase; D020794:Receptor Protein-Tyrosine Kinases