Alkyl-substituted benzoxazinorifamycin derivative, process for preparing
申请人:Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
公开号:US04859661A1
公开(公告)日:1989-08-22
A novel rifamycin derivative having the formula (I): ##STR1## wherein X.sup.1 is an alkyl group with 1 to 6 carbon atoms or a cycloalkyl group with 3 to 8 carbon atoms; X.sup.2 is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms; R.sup.1 is hydrogen atom or acetyl group; A is a group represented by the formula: ##STR2## wherein R.sup.2 is an alkyl group with 1 to 4 carbon atoms or an alkoxyalkyl group with 2 to 6 carbon atoms and R.sup.3 is an alkyl group with 1 to 6 carbon atoms or an alkoxyalkyl group with 2 to 6 carbon atoms, or a group represented by the formula ##STR3## wherein ##STR4## is a 3 to 9 membered cyclic amino group with 2 to 8 carbon atoms, R.sup.4 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, or salts thereof, a process for preparing the same and antibacterial agents containing the same as an effective ingredient. The rifamycin derivative of the present invention having the formula (I) shows a strong antibacterial activity against the Gram-positive bacteria and the acid-fast bacteria.
Alkyl-substituted benzoxazinorifamycin derivative, process for preparing the same and antibacterial agent containing the same
申请人:KANEGAFUCHI KAGAKU KOGYO KABUSHIKI KAISHA
公开号:EP0253340A1
公开(公告)日:1988-01-20
A novel rifamycin derivative having the formula (I):
一种具有式 (I) 的新型利福霉素衍生物:
Comparison of substituted 2-nitrophenol degradation by enzyme extracts and intact cells
作者:Brian R. Folsom、Ruth. Stierli、Rene P. Schwarzenbach、Josef. Zeyer
DOI:10.1021/es00051a018
日期:1994.2.1
The first catabolic pathway enzyme, nitrophenol oxygenase, transforms o-nitrophenol (ONP) to catechol. Thirteen of 16 substituted nitrophenols tested were actively transformed by both enzyme preparations and intact cells yielding a wide range of K(m) (K(s)) and V(max). Individual chemicals in binary mixtures demonstrated competitive inhibition. Chemical and physical characteristics (electron withdrawal, size, and position of substitution on the 2-nitrophenol ring) affected degradation kinetics. The strongest correlations were between K(m) or V(max) values and electron withdrawal, though there was also evidence for effects relating to position and size of substitution on the aromatic ring. Kinetic parameters determined for enzyme preparations did not correlate to those determined for intact cells. Though enzyme reactivity ultimately determined whether a given chemical would be transformed, the transformation by intact cells was apparently affected by factors other than those directly impacting the initial catabolic enzyme.
Reilly; Hickinbottom, Journal of the Chemical Society, 1920, vol. 117, p. 133