Disclosed are compounds of general formula (I),
wherein the groups R
1
, R
2
, R
a
and R
b
have the meanings given in the claims and specification, the tautomers, racemates, enantiomers, diastereomers and the mixtures thereof, and optionally the pharmacologically acceptable acid addition salts, solvates and hydrates thereof, and processes for preparing these thiazolyl-dihydro-cyclopentapyrazoles and the use thereof as pharmaceutical compositions.
Cephalosporins of the formula ##STR1## their pharmaceutically-acceptable, nontoxic salts, and hydrates thereof are produced, wherein A is hydrogen; unsubstituted or substituted alkyl; aryl; or R.sub.1 --X--, wherein X is --CO-- or --SO.sub.2 --, and R.sub.1 is hydrogen, unsubstituted or substituted alkyl; aryl; thienyl; furyl; amino; alkylamino; dialkylamino; pyrrolidyl; or piperidyl; Or when X is --CO--, R.sub.1 can also be alkoxy; B is phenyl, methylphenyl, chlorophenyl, hydroxyphenyl or the moiety ##STR2## E is hydrogen, hydroxyl or acetoxy; and C is a center of chirality. These compounds are particularly useful for their antimicrobial and, particularly, antibacterial effects.
Oxo-imidazolidine substituted cephalosporins and antibacterial
申请人:Bayer Aktiengesellschaft
公开号:US04107304A1
公开(公告)日:1978-08-15
Cephalosporins of the formula ##STR1## their pharmaceutically-acceptable, nontoxic salts, and hydrates thereof are produced, wherein A is hydrogen; unsubstituted or substituted alkyl; aryl; or R.sub.1 --X--, wherein X is --CO-- or --SO.sub.2 --, and R.sub.1 is hydrogen, unsubstituted or substituted alkyl; aryl; thienyl; furyl; amino; alkylamino; dialkylamino; pyrrolidyl; or piperidyl; Or when X is --CO--, R.sub.1 can also be alkoxy; B is phenyl, methylphenyl, chlorophenyl, hydroxyphenyl or the moiety ##STR2## E is hydrogen, hydroxyl or acetoxy; and C is a center of chirality. These compounds are particularly useful for their antimicrobial and, particularly, antibacterial effects.
Phenylimidazolidin-2-one Derivatives as Selective 5-HT<sub>3</sub> Receptor Antagonists and Refinement of the Pharmacophore Model for 5-HT<sub>3</sub> Receptor Binding
metoclopramide, a D2 receptorantagonist with weak 5-HT3receptorantagonist properties, and zetidoline, a D2 receptorantagonist. Starting from this premise, a series of phenylimidazolidin-2-one derivatives bearing a basic azabicycloalkyl or an imidazolylalkyl moiety were synthesized and evaluated for 5-HT3receptor radioligand binding affinity ([3H]-GR 43,694). In vitro 5-HT3receptorantagonist activity was
A NOVEL SYNTHESIS OF 3-SUBSTITUTED MDAZOLIDIN-2-ONE-1-CARBONYL CHLORIDES
作者:Weike Su、Kewei Huang、Yongmin Zhang
DOI:10.1080/00304940009356767
日期:2000.10
substitute for phosgene in industry.'-'? We found that TCF can replace phosgene in the synthesis of SICs and the reaction is shown in Scheme 1. The role of pyridine is to promote the decomposition of TCF to phosgene and to intercept the by-product HC1. Our experiment showed that without pyridine, the reaction time would be longer and the yield would be lower.
3-取代的咪唑烷-Zone1 -carbony1 氯化物 (SIC) 是对内酰胺抗生素半合成非常重要的中间体。'-6 SIC 已通过 N-取代的 imidazolidin-2-ones 与光气反应方便地制备。 '-' 然而,光气作为一种常见且有用的试剂在商业上已变得难以获得,因为它是一种剧毒、危险的气体。这种情况促使我们在 SIC 的合成中研究光气的替代品。氯甲酸三氯甲酯 (TCF) 被称为光气二聚体,在工业上用作光气的替代品。'-'?我们发现TCF在SICs的合成中可以代替光气,反应如图1所示。吡啶的作用是促进TCF分解为光气并拦截副产物HCl。