title: Microbial transformation of L-696,474, a novel cytochalasin as an inhibitor of HIV-1 protease.
abstract: The microbiological transformation of L-696,474 [1], a novel cytochalasin that is an inhibitor of HIV-1 protease, was investigated using Actinoplanes sp. ATCC 53771. Six hydroxylated metabolites 2-7 of 1 were isolated and purified using reversed-phase hplc. All six metabolites were found to have undergone hydroxylation at the C-16 methyl group (C-22) of 1. Three of the compounds, 3, 4, and 5, were further hydroxylated at the para (C-29), the meta (C-28), and both the para and the meta, positions of the phenyl ring, respectively. Metabolites 6 and 7 were shown to result from vicinal dihydroxylation on both C-16 and its attached Me (C-22). The metabolite 7 was further hydroxylated on the meta position of the phenyl ring. The structures of the metabolites were established using spectroscopic techniques including ms, 1H nmr, 13C nmr, and various 2D nmr spectroscopy experiments.
authors.affiliation: Merck Research Laboratories, Rahway, New Jersey 07065.
authors.forename: T S
authors.initials: TS
authors.lastname: Chen
authors.forename: G A
authors.initials: GA
authors.lastname: Doss
authors.forename: A
authors.initials: A
authors.lastname: Hsu
authors.forename: A
authors.initials: A
authors.lastname: Hsu
authors.forename: R B
authors.initials: RB
authors.lastname: Lingham
authors.forename: R F
authors.initials: RF
authors.lastname: White
authors.forename: R L
authors.initials: RL
authors.lastname: Monaghan
mesh_terms: D000192:Actinomycetales / Q000378:metabolism*; D000595:Amino Acid Sequence; D001711:Biotransformation; D003572:Cytochalasins / Q000378:metabolism*; D017320:HIV Protease Inhibitors / Q000378:metabolism*; D006900:Hydroxylation; D054833:Isoindoles; D008969:Molecular Sequence Data
chemical_list: D003572:Cytochalasins; D017320:HIV Protease Inhibitors; D054833:Isoindoles; C075543:18-dehydroxycytochalasin H