4-Unsubstituted azetidinone derivatives and process for preparation
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04207234A1
公开(公告)日:1980-06-10
New antimicrobial azetidinone derivatives and their salt of the formula: ##STR1## wherein R.sub.1 is amino or acylamino, and A is selected from a variety of groups.
Synthesis of a Maskedp -Quinone Methide ? -Lactam as an active metabolite of nocardicins
作者:Gholam H. Hakimelahi、Shwu-Chen Tsay、Jih Ru Hwu
DOI:10.1002/hlca.19950780212
日期:1995.3.22
Nocardicin A analogues 30, 34, and 38 as well as the highly strained quinone methide 43 were synthesized. β -Lactam 34 was found biologically active against several Gram-negative microorganisms in vitro; pyridinium N-oxide derivative 38 possessed activity against Gram-positive S. aureus bacterium. Masked p-quinone methide β -lactam 43 exhibited significant antimicrobial activity in vitro. A mechanism