A novel estrogen derivative represented by the formula: ##STR1## is useful for treating or preventing diseases caused by estrogen deficiency.
一种由以下公式表示的新型雌激素衍生物:##STR1##,可用于治疗或预防由雌激素缺乏引起的疾病。
Inhibitors of Bacterial Signal Peptidase: A Series of 6-(Substituted oxyethyl)penems.
作者:AILEEN ALLSOP、GERALD BROOKS、PETER D. EDWARDS、ARUN C. KAURA、ROBERT SOUTHGATE
DOI:10.7164/antibiotics.49.921
日期:——
A series of 6-(substituted oxyethyl)penem esters having the (5S) stereochemistry which are potent inhibitors of Escherichia coli leader peptidase is described. Structure-activity relationships are discussed.
moderate to good yields, selective for aliphaticalcohols, and a useful contribution to previously reported methodologies. Graphical abstract In this report, a simple method is reported for the acylation of aliphaticalcohols via a metal-free acylation of aliphaticalcohols with succinic anhydride in neutral condition. By presented method, various acylated aliphaticalcohols are obtained in good to excellent
A novel estrogen derivative represented by the formula:
is useful for treating or preventing diseases caused by estrogen deficiency.
一种由式表示的新型雌激素衍生物:
可用于治疗或预防由雌激素缺乏引起的疾病。
Spermexatin and spermexatol: new synthetic spermidine-based siderophore analogs
作者:Sushil K. Sharma、Marvin J. Miller、Shelley M. Payne
DOI:10.1021/jm00122a013
日期:1989.2
Syntheses of hexanediamine-based dihydroxamate (Hexamate), spermidine-based trihydroxamate (Spermexatins), and spermidine-based mixed siderophore analogues (Spermexatols) are described. Key intermediates include the N-hydroxysuccinimide esters of various hydroxamic acids, e.g., malonohydroxamate, succinohydroxamate, and glutarohydroxamate. These intermediates were synthesized, characterized, and incorporated as the ligating chains on spermidine. Also, mixed iron chelating compounds (Spermexatols) with both catechol and hydroxamic acid side chains were synthesized. The reagent carbobenzoxyimidazole was employed to distinguish between the primary and secondary amino groups of spermidine. The ability of these iron chelators to stimulate microbial growth is also described.