There is described a process for preparing monobactames of formula:
where R = acyl,
and their pharmaceutically acceptable salts, starting from ehyl (S)-3-hydroxybutanoate through the reaction intermediate (3S, 4R)-3-hydrazino-4-methyl-2-oxo-1-azetidine sulfonic acid or a salt thereof. This intermediate is new and therefore represents a further object of the present invention.
描述了一种制备单环内酰胺的过程,其
化学式为:其中R = 酰基,以及它们的药学上可接受的盐。该过程是从乙酰
(S)-3-羟基丁酸酯开始,通过反应中间体(3S, 4R)-3-
肼基-4-甲基-2-氧代-1-氮杂环
丙磺酸或其盐制备而成。该中间体是新的,因此也代表了本发明的另一个目标。