A New Synthesis of 1β-Alkylcarbapenems Utilizing Eschenmoser Sulfide Contraction of the Novel Thiazinone Intermediates
摘要:
Novel syntheses of the 1,beta-alkylcarbapenems were achieved on the basis of Eschenmoser sulfide contraction via the new bicyclic 1,3-thiazinone intermediates. 1,3-Thiazinones 7, 16, and 25 were effectively prepared from thioesters 5 and 22 using a C4-S bond formation process. The sulfide contraction reactions were performed by treatment of 7, 16, and 25 with base (NaH or KO-t-Bu) in the presence of triphenylphosphine to generate the corresponding carbapenem enolate 12, 17, and 26, which were trapped by (PhO)(2)POCl followed by the reaction with mercaptans to afford carbapenems 10a, 10b, 19, and 28, respectively.
Stereocontrolled syntheses of the diastereoisomeric 6-(1-hydroxyethyl)-2-ethylthio and 2-(2-aminoethylthio)-penem-3-carboxylates from a common monocyclic azetidinone precursor are described. Cu (I)-promoted cyclisation of suitable N/C-3 secopenems is shown to yield “isopenems” (7-oxo-2-thia-1-azabicyc1o[3.2.0]-hept-3-enes) as the sole bicyclic product.
Novel C-2 Substituted Carbapenem Derivatives Part III. Synthesis and Biological Activity of 2-(Functionalised Ethenyl, Oxyiminomethyl and .ALPHA.-(Hydroxy)benzyl)-Carbapenems.
作者:NICOLA J. C. CLEAR、JOHN S. DA VIES、A. JOHN EGLINGTON、STEPHEN C. M. FELL、JEREMY D. HINKS、NICHOLAS W. HIRD、ERIC HUNT、STEPHEN F. MOSS、MICHAEL J. PEARSON
DOI:10.7164/antibiotics.50.237
日期:——
The synthesis, antibacterial activity and stability to human dehydropeptidase-1 (DHP-1) of three small series of carbapenems carrying carbon-linked substituents at C-2 are described. C-2 Ethenyl carbapenems showed moderate antibacterial activity but poor stability to DHP-1. C-2 Oxyiminomethyl carbapenems demonstrated variable activity and stability. C-2 α-(Hydroxy)benzyl carbapenems were the most promising and showed good potency and DHP-1 stability.
A short synthesis of (±) 7-oxo-3-oxa-1-azabicyclo[3.2.0] heptane-2-carboxylic acid.
作者:Dieter Häbich、Paul Naab、Karl Metzger
DOI:10.1016/s0040-4039(00)81981-4
日期:1983.1
A short 4-step synthesis of the title compound 3 , an inhibitor of β-lactamases, is presented. The essential step utilizes the palladium(O)-catalyzed deprotection of an allyl ester.
A general synthesis for optically active penems is described. Penems undergo a novel thermal isomerisation reaction.
描述了旋光Penem的一般合成方法。青霉烯经历新的热异构化反应。
Processes for preparing carbapenem derivatives
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US05306816A1
公开(公告)日:1994-04-26
The invention relates to carbapenem derivatives useful as antimicrobial agents, more particularly to intermediate compounds for the preparations thereof of the formula ##STR1##