Diversification of a β-lactam pharmacophore via allylic C–H amination: accelerating effect of Lewis acid co-catalyst
摘要:
This report describes the use of Pd(II)/bis-sulfoxide 1 catalyzed intra- and intermolecular allylic C-H amination reactions to rapidly diversify structures containing a sensitive beta-lactam core similar to that found in the monobactam antibiotic Aztreonam. Pharmacologically interesting oxazolidinone, oxazinanone, and linear amine motifs are rapidly installed with predictable and high selectivities under conditions that use limiting amounts of substrate. Additionally, we demonstrate for the first time that intramolecular C-H amination processes may be accelerated using catalytic amounts of a Lewis acid co-catalyst [Cr(III)(salen)Cl 2]. (C) 2010 Elsevier Ltd. All rights reserved.
Diversification of a β-lactam pharmacophore via allylic C–H amination: accelerating effect of Lewis acid co-catalyst
摘要:
This report describes the use of Pd(II)/bis-sulfoxide 1 catalyzed intra- and intermolecular allylic C-H amination reactions to rapidly diversify structures containing a sensitive beta-lactam core similar to that found in the monobactam antibiotic Aztreonam. Pharmacologically interesting oxazolidinone, oxazinanone, and linear amine motifs are rapidly installed with predictable and high selectivities under conditions that use limiting amounts of substrate. Additionally, we demonstrate for the first time that intramolecular C-H amination processes may be accelerated using catalytic amounts of a Lewis acid co-catalyst [Cr(III)(salen)Cl 2]. (C) 2010 Elsevier Ltd. All rights reserved.
Methods and intermediates for preparing cis-4-oxoazetidine intermediates
申请人:SmithKline Corporation
公开号:US04166816A1
公开(公告)日:1979-09-04
The stereospecific cycloaddition of nitrogen containing acetic acid halides or anhydrides with Schiff bases having a carbalkoxy group substituted on the methine carbon atom offers new intermediates and methods for preparing synthetic cephalosporin congeners having antibacterial activity.
3-Substituted-6.beta.-(amino- and acylamino)-7-oxo-1,3-diazabicyclo[3.2.0]-
申请人:SmithKline Corporation
公开号:US04000154A1
公开(公告)日:1976-12-28
Novel bicyclic .beta.-lactam penicillin analogs which have antibacterial activity and intermediates for the synthesis thereof are disclosed. In particular, 3-acetyl-7-oxo-6.beta.-phenoxyacetylamino-1,3-diazabicyclo[3.2.0]heptane-2 -carboxylic acid and derivatives thereof are prepared.
3-Amino-2-hydroxy, halo or mercaptomethyl-4-oxoazetidines
申请人:SmithKline Corporation
公开号:US04257947A1
公开(公告)日:1981-03-24
The stereospecific cycloaddition of nitrogen containing acetic acid halides or anhydrides with Schiff bases having a carbalkoxy group substituted on the methine carbon atom offers new intermediates and methods for preparing synthetic cephalosporin congeners having antibacterial activity.
Cis-4-oxoazetidine intermediates and methods of preparing them
申请人:SmithKline Corporation
公开号:US04072674A1
公开(公告)日:1978-02-07
The stereospecific cycloaddition of nitrogen containing acetic acid halides or anhydrides with Schiff bases having a carbalkoxy group substituted on the methine carbon atom offers new intermediates and methods for preparing synthetic cephalosporin congeners having antibacterial activity.