efficient entry into cis monobactams starting from β -hydroxyesters is reported. This preparation is based on the stereoselective “electrophilicamination” of β-hydroxyester dianions and on Miller's biomimetic synthesis of the β-lactam nucleus. By this route, keyintermediates for the preparation of pharmacologically important cis aztreonam 2 and carumonam 3 were prepared.
Process for preparing monobactames and their intermediate product
申请人:CONSIGLIO NAZIONALE DELLE RICERCHE
公开号:EP0411541A3
公开(公告)日:1991-05-08
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.