Identification of isobaric product ions in electrospray ionization mass spectra of fentanyl using multistage mass spectrometry and deuterium labeling
作者:Wisut Wichitnithad、Terence J. McManus、Patrick S. Callery
DOI:10.1002/rcm.4673
日期:2010.9.15
cannot be differentiated by exact mass determinations, although in some cases deuterium labeling can provide useful structural information for identifying isobaric ions. Proposed fragmentation pathways of fentanyl were investigated by electrospray ionization ion trap mass spectrometry coupled with deuterium labeling experiments and spectra of regiospecific deuterium labeled analogs. The major product ion
The invention provides novel non-peptidic NPY Y2 receptor inhibitors useful in treating or preventing: anxiolytic disorders or depression; injured mammalian nerve tissue; conditions responsive to treatment through administration of a neurotrophic factor; neurological disorders; bone loss; substance related disorders; obesity; or an obesity-related disorder. Compounds of the invention are also useful in modulating endocrine functions, particularly endocrine functions controlled by the pituitary and hypothalamic glands, and are therefore useful in the treatment or prevention of inovulation and infertility.
“Selenium Polonovski Reaction” Using Benzeneselenenyl Triflate
作者:Renji Okazaki、Yukinori Itoh
DOI:10.1246/cl.1987.1575
日期:1987.8.5
Selenoxyammonium salts prepared from tertiary amine N-oxides and benzeneselenenyltriflate undergo rearrangement in the presence of triethylamine or DBU to give α-selenoxyamines, which react in situ with an electrophile or nucleophile to afford new secondary or tertiary amine derivatives.
The invention provides a method for the preparation of fentanyl comprising: (a) reacting 4-piperidone hydrochloride (NPP) with aniline in presence of reducing environment to produce 4-anilinopiperidine (4-ANPP), (b) reacting the 4-ANPP as obtained from step (a) with phenethyl halide under reflux conditions in highly alkaline medium to give 4-anilino-N-phenethylpiperidine, and (c) converting the 4-anilino-N-phenethylpiperidine to fentanyl by reacting with propionyl chloride in presence of halogenated hydrocarbons, then isolating fentanyl by solvent extraction and purifying by crystallization from petroleum ether at a temperature ranging from 60-80° C.
The invention provides novel non-peptidic NPY Y2 receptor inhibitors useful in treating or preventing: anxiolytic disorders or depression; injured mammalian nerve tissue; conditions responsive to treatment through administration of a neurotrophic factor; neurological disorders; bone loss; substance related disorders; obesity; or an obesity-related disorder. Compounds of the invention are also useful in modulating endocrine functions, particularly endocrine functions controlled by the pituitary and hypothalamic glands, and are therefore useful in the treatment or prevention of inovulation and infertility.