Studies in organic mass spectrometry. IV. Electron impact induced fragmentation of 2-substituted 3-(5-isoxazolyl)-4(3<i>H</i>)-quinazolinones of pharmaceutical interest
作者:Leopoldo Ceraulo̊、Salvatore Plescia、Giuseppe Daidone、Maria Luisa Bajardi
DOI:10.1002/jhet.5570210457
日期:1984.7
The fragmentation under electron impact of thirteen 2-substituted-3-(5-isoxazolyl)-4(3H)-quinazolinones has been investigated with the aid of metastable ion detection and high resolution measurements. Molecular ions are always abundant and the main primary fragmentation route involves acetonitrile elimination through isoxazole ring opening. The other common processes, particularly those leading to
借助于亚稳态离子检测和高分辨率测量,研究了十三种2-取代的-3-(5-异恶唑基)-4(3 H)-喹唑啉酮在电子作用下的断裂。分子离子总是很丰富,主要的主要裂解途径涉及通过异恶唑开环消除乙腈。报告并讨论了其他常见的过程,特别是导致大量[RC 8 H 4 N 2 ] +离子(b或b')的过程,以及由于2-取代基的性质而引起的过程。