93860-66-3Relevant articles and documents
Chiral DNA gyrase inhibitors. 3. Probing the chiral preference of the active site of DNA gyrase. Synthesis of 10-fluoro-6-methyl-6,7-dihydro-9- piperazinyl-2H-benzo[a]quinolizin-20-one-3-carboxylic acid analogues
Fecik, Robert A.,Devasthale, Pratik,Pillai, Segaran,Keschavarz-Shokri, Ali,Shen, Linus,Mitscher, Lester A.
, p. 1229 - 1236 (2007/10/03)
In pursuit of an apparent literature anomaly, S- and R-6-methyl-6,7- dihydro-2H-benzo[a]-quinolizin-2-one-3-carboxylic acids (12 and 22) were synthesized by an unambiguous route from optically active norephedrines, and their antibacterial potencies were measured. Against Gram-negative microorganisms and DNA gyrase a preference for S-absolute configuration was found whereas R-absolute stereochemistry was more active against Gram-positives. These results are in partial conflict with an earlier report. In an attempt to enhance potency, racemic 10-fluoro-9-piperazinyl (35) and related analogues were synthesized by a novel route. The latter analogues were surprisingly unimproved in potency. The implications of these findings are briefly discussed.
Aeruginoguanidines 98-A-98-C: Cytotoxic unusual peptides from the cyanobacterium Microcystis aeruginosa
Ishida, Keishi,Matsuda, Hisashi,Okita, Yuji,Murakami, Masahiro
, p. 7645 - 7652 (2007/10/03)
Aeruginoguanidines 98-A-98-C (1-3) were isolated from the cyanobacterium Microcystis aeruginosa (NIES-98). The structures of aeruginoguanidines 98-A-98-C (1-3) were determined by two-dimensional 1H-1H and 1H-13C NMR correlation experiments and confirmed by mass spectral analysis. The absolute stereochemistry of 1, consisting of Hphpa trisulfate (1-(4-hydroxy-3-hydroxymethyl)phenyl-1-hydroxy-2-propylamine 4′,3′,1-tri-O-sulfate), MpArg (Nα-methyl-Nω-prenylarginine) and MgArg ((Z)-Nα-methyl-Nω-geranylarginine), was determined by the NMR analyses of phenylglycine methyl ester (PGME) or Boc phenylglycine (BPG) derivatives of acid hydrolysates. These compounds showed moderate cytotoxicity against the P388 murine leukemia cells.