4-(Protected amino)-3-oxo-1-(substituted and unsubstituted methylene)-1,2-pyrazolidinium ylides are intermediates to 7-substituted bicyclic pyrazolidione antimicrobials.
Synthesis of a 3-keto bicyclic pyrazolidinone using a Curtius rearrangement
作者:David A. Neel、Richard E. Holmes、Jonathan W. Paschal
DOI:10.1016/0040-4039(96)01003-9
日期:1996.7
The synthesis of bicyclic pyrazolidinone 2 is described. Traditional methods for penem and cephem ring cyclization were found to be unsuccessful and new methodology using a Curtius rearrangement was utilized. The 3-enamine 11 was hydrolysed to the desired β-keto ester 2b without substantial loss of the t-BOC protecting group.
[EN] SIDEROPHORE CONJUGATED PYRAZOLIDINONES, AND ANALOGUES THEREOF<br/>[FR] PYRAZOLIDINONES CONJUGUÉES À DES SIDÉROPHORES ET ANALOGUES DE CELLES-CI
申请人:UNIV YALE
公开号:WO2020018929A1
公开(公告)日:2020-01-23
In one aspect, the invention provides compounds and methods that are useful for treating bacterial infections.
在一个方面,该发明提供了用于治疗细菌感染的化合物和方法。
The chemistry of substituted pyrazolidinones; applications to the synthesis of bicyclic derivatives
作者:Robert J. Ternansky、Susan E. Draheim
DOI:10.1016/s0040-4020(01)88183-7
日期:——
Methodology for the selective chemical derivatizations of substituted pyrazolidinones is described. The application of these methods to the preparation of [4.3.0] and [3.3.0] bicyclic systems is also discussed. The importance of these latter systems as nuclei of antibacterial agents with potential utility in the treatment of infectious disease provides the motivation for these investigations.
Thioaldehydes in cycloaddition reactions. Synthesis of nuclear analogues of pyrazolidinone antibacterial agents
作者:Timothy A. Shepherd、Louis N. Jungheim
DOI:10.1016/s0040-4039(00)80679-6
日期:1988.1
generated thioaldehydes have been found to undergo 1,3-dipolarcycloadditions with a pyrazolidiniumylide to produce a nuclear analogue of pyrazolidinone antibacterialagents.