title: Antimitotic agents. Chiral isomers of ethyl [5-amino-1,2-dihydro-3-(4-hydroxyphenyl)-2-methylpyrido[3,4-b]pyrazin-7 -yl]carbamate.
abstract: Metabolism studies with ethyl [5-amino-1,2-dihydro-2-methyl-3-phenylpyrido[3,4-b]pyrazin-7 - yl]carbamate (1) in mice were reported previously to give a hydroxylated metabolite, which was methylated to give a methoxy derivative. The metabolite and its derivatives were considered to be 4-(substituted)phenyl compounds, which have been confirmed by the synthesis of the [1,2-dihydro-3-(4-hydroxyphenyl)- and [1,2-dihydro-3-(4-methoxyphenyl)pyrido[3,4-b]-pyrazin-7-yl]carbama tes (17 and 16). Both the S- and R-isomers of 17 are active in several biological systems, but the S-isomer is more potent then the R-isomer. The difference in activity between the S- and R-isomers of 17 is similar with that observed for S- and R-isomers of 1. As model reactions, several O-substituted derivatives were prepared by alkylation of (RS)-17 with benzyl chloride and condensation of (RS)-17 with butyl isocyanate and (S)-17 with 2-chloroethyl isocyanate.
authors.affiliation: Kettering-Meyer Laboratory, Southern Research Institute, Birmingham, Alabama 35255-5305.
authors.forename: C
authors.initials: C
authors.lastname: Temple
authors.forename: G A
authors.initials: GA
authors.lastname: Rener
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000627:therapeutic use; D002478:Cells, Cultured; D007939:Leukemia L1210 / Q000188:drug therapy; D007941:Leukemia P388 / Q000188:drug therapy; D051379:Mice; D011719:Pyrazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000627:therapeutic use; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D000970:Antineoplastic Agents; D011719:Pyrazines