The fragmentation mechanism of beta-(N-alkyl/arylamino)-alpha,beta-unsaturated carboxylates under electrospray ionization conditions.
The positive ion mass spectrometric behavior of six beta-(N-alkyl/arylamino)-alpha,beta-unsaturated carboxylates, alpha-(1-alkyl/arylaminoethylidene)-gamma-lactones, has been studied under electrospray ionization conditions. Their fragmentation pathways are described and supported by tandem mass spectrometry. The protonated compounds are apt to eliminate a water, and a water plus a oxacyclopent-2-yne molecule. Some of the compounds show a tendency to undergo a four-membered ring contraction rearrangement to lose a carbon dioxide. The fragmentation patterns of these compounds exhibit a strong substituent dependency.
Yin
W
W
Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, People's Republic of China.
Ma
Y
Y
Zhao
Y
Y
D002264:Carboxylic Acids / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods
D002264:Carboxylic Acids