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
AMINOPHOSPHONIC ACIDS BEARING HETEROCYCLIC MOIETY. PART 4.<sup>1</sup> SYNTHESIS OF 2-PYRIDYL AND 4-PYRIDYLMETHYL-(AMINO)PHOSPHONIC ACIDS
作者:Bogdan Boduszek
DOI:10.1080/10426509708043492
日期:1997.3.1
and 4-pyridylmethyl(amino)phosphonicacids at not available by hydrolysis of corresponding phosphonicesters by means of aq. hydrochoric acid. During hydrolysis of these esters a cleavage of C-P bond occurs, which leads to a repulsion of phosphorus moiety and formation of the corresponding amine. It was found, that silylation of pyridylmethyl(amino)phosphonic diethyl esters with bromotrimethylsilane