title: Methylene-gem-difluorocyclopropane analogues of nucleosides: synthesis, cyclopropene-methylenecyclopropane rearrangement, and biological activity.
abstract: Alkylation-elimination of adenine and 2-amino-6-chloropurine with gem-difluorocyclopropane dibromide 10 gave E- and Z-methylene-gem-difluorocyclopropanes 11a, 11b, 12a, and 12b and gem-difluorocyclopropenes 13a and 13b. Debenzylation of intermediates 11a, 11b, 12a, and 12b afforded E- and Z-methylenecyclopropanes 4a, 4b, 5a, and 5b. Hydrolysis of 2-amino-6-chloropurine derivatives 4b and 5b afforded guanine analogues 4c and 5c. Composition of products (except 14b) obtained from alkylation-elimination reflects thermodynamically controlled cyclopropene-methylenecyclopropene rearrangement. The E-isomer 4a was moderately active against human cytomegalovirus and along with the Z-isomer 5a was active against leukemia L1210 and solid tumors in vitro.
authors.affiliation: Developmental Therapeutics Program, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, 110 East Warren Avenue, Detroit, Michigan 48201-1379, USA.
authors.forename: R
authors.initials: R
authors.lastname: Wang
authors.forename: M B
authors.initials: MB
authors.lastname: Ksebati
authors.forename: T H
authors.initials: TH
authors.lastname: Corbett
authors.forename: E R
authors.initials: ER
authors.lastname: Kern
authors.forename: J C
authors.initials: JC
authors.lastname: Drach
authors.forename: J
authors.initials: J
authors.lastname: Zemlicka
mesh_terms: D000818:Animals; D019380:Anti-HIV Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002460:Cell Line; D003521:Cyclopropanes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D009705:Nucleosides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D019380:Anti-HIV Agents; D000970:Antineoplastic Agents; D000998:Antiviral Agents; D003521:Cyclopropanes; D009705:Nucleosides; C021985:cyclopropene