Novel bicyclic .beta.-lactams and intermediates useful in their preparation are disclosed. In particular, 7.beta.-acyl-amino- and 7.beta.-amino-8-oxo-4-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acids are prepared. The acylated compounds are antibacterial agents.
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.
A new bicyclic .beta.-lactam containing the novel 7-oxo-1-aza-3-thiabicyclo[3.2.0]heptane nucleus (isopenicillin) is disclosed. The compounds have antibacterial activity against gram positive and gram negative organisms. Intermediates useful for the preparation of these active products are also disclosed.
An efficient asymmetric synthesis of 3S, 4S-3-acylamino-4-hydroxymethylazetidin-2-ones
作者:Richard C. Thomas
DOI:10.1016/s0040-4039(01)93751-7
日期:1989.1
An efficient method for the synthesis of azetidinones 1 and 2 from readily available precursors is presented. [2 + 2]-Cycloaddition gives enantiomerically pure azetidinone 5 in 46% isolated yield after a single crystallization. Olefin cleavage and N-1-deprotection afford the desired products in high yield via crystalline intermediates.
Isopenicillins, processes for their preparation, and compositions containing them
申请人:SMITHKLINE BECKMAN CORPORATION
公开号:EP0000645A1
公开(公告)日:1979-02-07
Isopenicillins of the formula
in which
R is acylamino, azido, or amino; and
M is hydrogen a pharmaceutically acceptable cation, or a removable carboxylic acid protecting ester, can be prepared by ring-closing an appropriately 3-substituted-4- halomethyl β-lactam of the formula
in which
R' is acylamino or azido;
and when a compound (1) is required, in which R is amino, a protecting acyl group of an acylamino group R' is removed. Compound I show antibacterial activity against gram positive and gram negative organisms.
异青霉素
其中
R 是酰氨基、叠氮或氨基;和
M 为氢或药学上可接受的阳离子或可去除的羧酸保护酯,可通过环合适当的 3-取代-4-卤甲基 β-内酰胺制备,其式为
其中
R'是酰氨基或叠氮;
当需要R为氨基的化合物(1)时,去除酰氨基R'的保护酰基。化合物 I 对革兰氏阳性和革兰氏阴性菌具有抗菌活性。