Preparation of penem derivatives and azetidinone intermediates
申请人:Pfizer Inc.
公开号:US04595539A1
公开(公告)日:1986-06-17
Certain 2-substituted-2-penem-3-carboxylic acid compounds and pharmaceutically-acceptable salts thereof can be prepared from the appropriate xanthate or trithiocarbonate by desulfurization and addition of an electrophilic sulfur compound followed by halogenation and ring closure. The corresponding desulfurized and halogenated olefinic intermediates are disclosed.
Process and intermediates for the preparation of penem derivatives
申请人:Pfizer Inc.
公开号:US04619783A1
公开(公告)日:1986-10-28
Certain substituted-2-penem-3-carboxylic acid compounds, and pharmaceutically-acceptable salts thereof, can be prepared from the appropriate xanthate or trithiocarbonate by desulfurization, followed by halogenation and ring closure. The corresponding desulfurized and halogenated intermediates are disclosed.
2-Penem-3-carboxylic acid compounds of the formula ##STR1## in which R.sub.1 represents hydrogen, an organic radical bonded by a carbon atom to the ring carbon atom or an etherified mercapto group and R.sub.2 represents hydroxy or a radical R.sub.2.sup.A forming together with the carbonyl grouping --C(.dbd.O)-- a protected carboxyl group, 1-oxides thereof, as well as salts of such compounds having salt-forming groups, in racemic and optically active form, processes for their preparation, pharmaceutical compositions containing such compounds, and their use as antibiotics, and intermediates and their processes which are useful in the production of the compounds of the formula I.
An alternative total synthesis of protected (±)-thienamycin (2) and an analogue is described. (±)-4β-(2,2-Dimethoxyethyl)-3α-[(1R*)-1-(p-nitrobenzyloxycarbonyloxy)ethyl]azetidin-2-one (5), prepared from isoxazoline derivatives (4), was converted into the 2-(p-nitrobenzyloxycarbonylamino)ethyl (12) and phenyl (13) thioester phosphoranes. Intramolecular Wittig reaction of (12) and (13) produced the corresponding
描述了受保护的(±)-硫霉素(2)和类似物的另一种全合成。由异恶唑啉衍生物(4)制备的(±)-4β-(2,2-二甲氧基乙基)-3α-[(1 R *)-1-(对硝基苄氧基羰氧基氧基)乙基]氮杂环丁烷-2-酮(5)为转化为2-(对硝基苄氧基羰基氨基)乙基(12)和苯基(13)硫酯磷烷。(12)和(13)的分子内维蒂希反应以不良的产率产生了相应的碳青霉烯(2)和(3)。利用卡宾插入反应并随后引入硫化物部分,实现了将(5)有效转化为对硝基苄基保护的噻霉素衍生物(2)和类似物(3)。
6-substituted penem compounds
申请人:Ciba-Geigy Corporation
公开号:US04692442A1
公开(公告)日:1987-09-08
The invention relates to 2-penem-3-carboxylic acid compounds of the formula ##STR1## in which R.sub.a represents an organic radical bonded by a carbon atom to the ring carbon atom, a free, etherified or esterified hydroxy or mercapto group or a halogen atom, R.sub.1 represents hydrogen, an organic radical bonded by a carbon atom to the ring carbon atom, or an etherified mercapto group, and R.sub.2 represents a hydroxy group or an R.sub.2.sup.A radical that together with the carbonyl grouping --C(.dbd.O)-- forms a protected carboxyl group, and to salts of such compounds with salt-forming groups, processes for the manufacture of such compounds, pharmaceutical preparations containing compounds of the formula I with pharmacological properties, and their use. The compounds have antibiotic activity.