[EN] CARBACEPHEM ß-LACTAM ANTIBIOTICS<br/>[FR] ANTIBIOTIQUES BÊTA-LACTAMES À CARBACÉPHÈME
申请人:ACHAOGEN INC
公开号:WO2009055696A1
公开(公告)日:2009-04-30
Carbacephem β-lactam antibiotics having the following chemical structures (I) and (II) are disclosed, including stereoisomers, pharmaceutically acceptable salts, esters and prodrugs thereof, wherein Ar2, R1, R2 and R3 are as defined herein. The compounds are useful for the treatment of bacterial infections, in particular those caused by methicillin-resistant Staphylococcus spp.
A series of novel 2-methoxyimino-1,2,3-thiadiazole-5-acetamide derivatives were synthesised. Their structures were identified by means of elemental analysis, IR, 1H NMR and MS spectra. The preliminary biologicalactivity tests showed that some of the compounds showed some fungicidal activity.
The 15N nmr spectra of a series of 1,2,3-thiadiazoles reveal the strong influence of substituents at C-5 on the N-2 resonance. Upon methylation, the two thiadiazole nitrogen resonances are shielded, but the most dramatic shift is observed for the methylated nitrogen, Δδ > 140 ppm. The 15Nchemicalshifts of some mesoionic thiadiazoles were also determined and explained by the dual effect of 5-substitution
一系列1,2,3-噻二唑的15 N nmr光谱揭示了C-5处取代基对N-2共振的强烈影响。甲基化后,两个噻二唑氮的共振被屏蔽,但是对于甲基化的氮,观察到最剧烈的变化,Δδ> 140 ppm。还通过5-取代和成盐的双重作用确定并解释了某些中离子噻二唑的15 N化学位移。通过消除这些影响,发现15 N的10和11化学位移是不寻常的,并反映了噻戊二烯的特性。
Process for making 5-amino-1,2,3-thiadiazoles
申请人:Schering AG
公开号:US04113733A1
公开(公告)日:1978-09-12
5-amino-1,2,3-thiadiazoles of the formula ##STR1## are made by reacting halogenoacetaldehydes of the formula X--CH.sub.2 --CH.dbd.O II with hydrazine derivatives of the formula H.sub.2 N--NH--COR III preferably in an aqueous medium or in a mixture of an aqueous medium with organic solvents so as to form acylhydrazones of the formula X--CH.sub.2 --CH.dbd.N--CH--CO--R IV whereupon the latter are reacted with thionylchloride of the formula SOCl.sub.2 V whereby 5-halogeno-1,2,3-thiadiazoles are formed which are then reacted with ammonia preferably in the presence of a catalyst such as a mineral acid or Lewis acid whereby the desired product is obtained. The products are useful in making plant protection agents and herbicides such as the 1,2,3-thiadiazolyl-urea derivatives.