摘要:
The 4-acyloxyazetidin-2-ones, which are intermediates in the production of carbapenems and penems, are produced from 4-furanylazetidin-2-ones by a sequential oxidation-reduction-oxidation reaction scheme.
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 C₂-C₁₀ carboxylate catalyzed cyclization of an ester of a 4-(1-alkoxy- or 1-substituted alkoxy)-2-oxo-4-azetidinyl)-α-diazo-β-ketobutyric acid and an ester of a 5-(1-alkoxy- or 1-substituted alkoxy-2-oxo-4-azetidinyl)-α-diazo-β-ketovaleric acid respectively. The process is carried out in an inert organic solvent at a temperature between about 15° C and about 85° C. The 1-carba bicyclic β-lactams are intermediates for preparing antibiotics.
摘要:
β-Lactam compounds of the formula (I) including pharmaceutically acceptable salts and in vivo hydrolysable esters, processes for their preparation and their use as antibiotics: wherein
R 1 is hydrogen, methoxy or formamido; R 2 is an acyl group, in particular that of an antibacterially active cephalosporin; R 3 is hydrogen or a readily removable carboxy protecting group (such as a pharmaceutically acceptable in-vivo hydrolysable ester group); R 4 is a y- or δ-lactone,ring optionally containing one or (where applicable) two endocyclic double bonds, which ring is optionally substituted at any carbon atom by alkyl, dialkylamino, alkoxy, hydroxy, halogen or aryl, which in the case of more than one substituent may be the same or different, or is optionally di-substituted at two adjacent carbon atoms, which are available for substitution, to form an aromatic fused bicyclic system; x and y are independently 0 or 1; x is S, SO, S0 2 , 0 or CH 2 ; and Y is 0 or S.
摘要翻译:式(I)的β-内酰胺化合物包括药学上可接受的盐和体内可水解的酯,其制备方法及其作为抗生素的用途:其中R 1是氢,甲氧基或甲酰氨基; R 2是酰基,特别是抗菌活性头孢菌素的酰基; R 3是氢或易除去的羧基保护基(例如药学上可接受的体内可水解的酯基); R 4是γ-或δ-内酯,任选地含有一个或(如适用的话)两个内环双键,所述环在任何碳原子上被烷基,二烷基氨基,烷氧基,羟基,卤素或芳基任选取代, 在多于一个取代基的情况下可以相同或不同,或者在可用于取代的两个相邻碳原子处任意地被二取代,以形成芳族稠合双环体系; x和y独立地为0或1; x是S,SO,SO 2,O或CH 2; 而Y是O或S.
摘要:
The crystalline bis(DMF), dihydrate mono(DMF) and mono(DMF) forms of 7β-[2′-(R)-2′-phenyl-2′-aminoacetamido] -3-chloro-3-(1-carbadethiacephem)-4-carboxylic acid (LY163892) are useful intermediates to the monohydrate form of LY163892.