摘要:
A compound, having the following formula: or resonance form thereof, or salt thereof, or salt of resonance form thereof is provided, wherein R1-R4 and n are defined herein. Compositions and methods including the compound are also provided.
摘要:
Embodiments herein provide compounds and methods of making and using such compounds for prevention and treatment of multidrug resistant bacteria. In particular, embodiments are directed to anti-bacterial agents from benzo[d]heterocyclic scaffolds for prevention and treatment of multidrug resistant bacteria.
摘要:
0-lactamyl alkanoic acids are described. Methods for treating various premenstrual disorders using or more O-lactamyl alkanoic acids are also described.
摘要:
Novel 2-(azetidin-2-on-1-yl)alkanedioic acid derivatives and 2-(azetidin-2-on-1-yl)alkoxyalkanoic acid derivatives are described for use in the treatment of disease states responsive to antagonism of the vasopressin V1a receptor
摘要翻译:描述了新的2-(氮杂环丁烷-2-对-1-基)烷二酸衍生物和2-(氮杂环丁-2-酮-1-基)烷氧基烷酸衍生物用于治疗对加压素拮抗作用有反应的疾病状态 V 1a受体
摘要:
1-Carbapenam-2-one-3-carboxylic acid and 1-carba-3-hydroxy-3-cephem-4-carboxylic acid and esters thereof are provided by a process comprising a rhodium C.sub.2 -C.sub.10 carboxylate catalyzed cyclization of an ester of a 4-(1-alkoxy- or 1-substituted alkxoy)-2-oxo-4-azetidinyl)-.alpha.-diazo-.beta.-ketobutyric acid and an ester of a 5-(1-alkoxy- or 1-substituted alkoxy-2-oxo-4-azetidinyl)-.alpha.-diazo-.beta.-ketovaleric acid respectively. The process is carried out in an inert organic solvent at a temperature between about 15.degree. C. and about 85.degree.0 C. The 1-carba bicyclic .beta.-lactams are intermediates for preparing antibiotics.
摘要:
A stereoselective process for chiral intermediates to 1-carbapenem and 1-carbacephalosporins is provided comprising the use of an N-acyl-(4R)-substituted-1,3-thiazolidine-2-thione as a chiral auxiliary in boron enolate mediated aldol condensation with a protected-.beta.-keto ester aldehyde. E.g., benzyl 3,3-(ethylenedioxy)-4-formylbutyrate is condensed with the boron enolate formed with n-butyryl (4R)-methoxycarbonyl-1,3-thiazolidine-2-thione to provide benzyl 3,3-ethylenedioxy-(5R)-hydroxy-6-[(4R)-methoxycarbonyl-1,3-thiazolidine-2-thione-3-ylcarbonyl]octanoate. Displacement of the thiazolidine-2-thione chiral auxiliary moiety with an O-alkyl, O-acyl or O-aralkyl hydroxyamine provides the corresponding chiral intermediate as the hydroxamate.
摘要:
Compounds represented by the formula [1] R1 is H or a substituent; R2 and R3 are C1-C3 alkyl; R4 is siderophore group e.g. CH3—(CH2)n—C(O)—N(OH)—(CH2)m— with n=10-22, m=2-6; X is O, S, or NH; X1 is O or NH; Y is H or alkyl; Z is H or substituted amino, e.g., t-BocNH or CbzNH, and r is 2-4; are useful in the method provided for treating tuberculosis. [1] is prepared by coupling [7], wherein HX1 is HO— or H2N—, with [4] obtained as the free acid after saponification of the methyl ester.
摘要:
5'-O-Acyl-5-fluorouridines and 5'-O-acyl-5-sluorocytidines are prepared by the direct acylation of the 5'-hydroxyl group with amino acids under Mitsunobu conditions and the amino acyl derivatives are coupled with other amino acids or peptides to provide antibacterial and antifungal derivatives of the nucleosides. For example, 5-fluorouridine is acylated at the 5'-hydroxyl group with an amino protected L-valine and the acylation product is deprotected to provide 5'-O-(L-valinyl)-5-fluorouridine having activity against Gram-positive bacteria including resistant staphylococcus. Preferred peptide derivatives comprise the tripeptides of ornithine and lysine wherein the terminal amino group is substituted by both hydroxy and acetyl. The latter peptides inhibit the growth of C. albicans.
摘要:
A process for 4-halomethylazetidin-2-ones is provided which comprises mixing in an inert solvent a positive halogen reagent in the presence of a weak base with a .beta.,.gamma.-unsaturated O-acylhydroxamate of the formula ##STR1## wherein R is protected amino, lower alkyl or phenyl substituted lower alkyl, R.sub.2 is a substituent such as lower alkyl which may be substituted by formyl, hydroxy, halogen, etc., and R.sub.1 is alkoxy, benzyloxy, etc. When R is a protected amino group, the process provides cis-4-halomethylazetidin-2-ones, while when R is alkyl or phenylalkyl, the trans isomer is obtained. The 4-halomethylazetidinones are useful intermediates for known antibiotic compounds.
摘要:
Process for N-acyloxy or sulfooxy 2-azetidinones comprising O-acylation of a .beta.-hydroxy or .beta.-halo hydroxamic acid, and cyclizing the O-acylhydroxamate with TPP-CCl.sub.4 -TEA or with TPP-dialkylazodicarboxylate to the N-acyloxy-2-azetidinone. Solvolysis of the acyl group provides an N-hydroxy-2-azetidinone. E.g., N-Cbz-L-serine is converted to the O-acetyl hydroxamate, cyclized and solvolyzed to N-hydroxy-3-(Cbz-amino)-2-azetidinone. The N-hydroxy-2-azetidinones are useful intermediates to monocyclic .beta.-lactam antibiotics and .beta.-lactamase inhibitors.