title: An alternate synthesis of the Tat-antagonist 7-chloro-N-methyl-5-(1H-pyrrol-2-yl)-3H-1,4-benzodiazepin-2-amine.
abstract: An alternative synthesis of 7-chloro-N-methyl-5-(1H-pyrrol-2-yl)-3H-1,4-benzodiazepin-2-amine, the compound that inhibits gene expression by HIV-1 at the level of transcriptional transactivation by Tat, has been developed. The process is based on ring expansion of 6-chloro-2-chloromethyl-4-(1H-pyrrol-2-yl)quinazoline 3-oxide which leads to the corresponding benzodiazepine Ro24-7429. Quinazoline 3-oxide formation in the presence of boron trifluoride gives a tetracyclic system containing a 2,2-difluoro-1,3,6,2-oxadiazaborine ring that survives ring expansion to 13-chloro-5,5-difluoro-9-(methylamino)-5H-pyrrolo[1',2':3,4]- 1,3,6,2-oxadiazabora[6,5-d]-8H-1,4-benzodiazepin-7-ium hydroxide inner salt. This unusual benzodiazepine does not significantly inhibit Tat-mediated gene expression by HIV-1.
authors.affiliation: Roche Research Center, Hoffmann La Roche Inc., Nutley, NJ 07110, USA.
authors.forename: H
authors.initials: H
authors.lastname: Maehr
authors.forename: G
authors.initials: G
authors.lastname: Zenchoff
authors.forename: D L
authors.initials: DL
authors.lastname: Coffen
mesh_terms: D001569:Benzodiazepines / Q000138:chemical synthesis* / Q000494:pharmacology; D015696:Gene Products, tat / Q000037:antagonists & inhibitors*; D015497:HIV-1 / Q000187:drug effects; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008744:Methylamines / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D011758:Pyrroles; D014779:Virus Replication / Q000187:drug effects; D054322:tat Gene Products, Human Immunodeficiency Virus
chemical_list: D015696:Gene Products, tat; D008744:Methylamines; D011758:Pyrroles; D054322:tat Gene Products, Human Immunodeficiency Virus; D001569:Benzodiazepines; C070024:Ro 24-7429; C027451:methylamine