very similar spectra for many alkyl phosphonic acid isomers, which complicates the identification process. We present a new reagent, 3‐pyridyldiazomethane, for preparing picolinyl ester derivatives of alkyl methylphosphonic acids facilitating the determination of their structure by enhancing predictable fragmentation of the O‐alkyl chain. This fragmentation is directed by the nitrogen nucleus of the pyridyl
The pyridine n-oxide group. A potent radical stabilizing function
作者:Xavier Creary、M.E. Mehrsheikh-Mohammadi
DOI:10.1016/s0040-4039(00)80200-2
日期:1988.1
The rate of the methylenecyclopropane rearrangement is greatly enhanced by the 4-pyridyl N-oxidegroup due to spin delocalization in the transition state which imparts nitroxide radical character to the biradical intermediate.
IMIDAZOLO-HETEROARYL DERIVATIVES WITH ANTIBACTERIAL PROPERTIES
申请人:Escaich Sonia
公开号:US20100130489A1
公开(公告)日:2010-05-27
The invention relates to Imidazolo-heteroaryl derivatives of formula (I). The compounds inhibit the activity of the Dlta enzyme of Gram-positive bacteria and are useful to treat Gram-positive bacterial infections. Furthermore the application discloses method for assessing the Dlta inhibitory activity of tested molecules and a method for measuring the efficacy of molecules in inhibiting bacteria proliferation in vitro.