Oksman P, Stájer G, Pihlaja K, Karelson M. Electron impact ionization mass spectrometry and intramolecular cyclization in 2-substituted pyrimidin-4(3H)-ones.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 1994;
5:113-119. [PMID:
24222522 DOI:
10.1016/1044-0305(94)85043-7]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/1993] [Revised: 10/01/1993] [Accepted: 10/01/1993] [Indexed: 06/02/2023]
Abstract
Electron impact ionization mass spectrometry indicates that the behavior of W-unsubstituted pyrirnidin-4-ones with CH2-R type substitution at C-2 differs from homologs that are N-substituted and/or 2-aryl- or 2-methyl-substituted. A dominant intramolecular cycliza-tion was found to occur between 3ZV (in agreement with the predominance of the 3NH tautomers) and the ortho positions of the aryl moiety in compounds with a CH2-aryl substitution at C-2. Theoretical calculations with an AMI SCFR method on 2-, 6-, and 2, 6-disubstituted pyrimidin-4-ones support the mass spectrometric observations.
Collapse