Mass spectrometric study of 2-keto(thio)tetrahydropyrimidine derivatives

Authors :: Stashenko, E. E.
Zakharov, P. I.
Pleshakov, V. G.
Subbotin, B. S.
Source :: Chemistry of Heterocyclic Compounds; March 1989, Vol. 25 Issue: 3 p301-305, 5p
Publication Year :: 1989
Abstract: The fragmentation pathways of 2-keto(thio)-6-methyl-5-carbethoxy(acetyl)-4-aryl-1,2,3,4-tetrahydropyrimidines were established using high resolution mass spectra and DADI spectra. An unusual rearrangement was observed, which involves cyclization of the aryl substituent in the 4 position with the oxygen of an ester group and elimination of a C<subscript>2</subscript>H<subscript>5</subscript> radical.