Determination of regioselectivity in ring opening oftert-butylaziridinones by a combination of15N labeling and electrospray ionization-ion trap mass spectrometry
作者:E. R. Talaty、M. J. Van Stipdonk、M. J. Hague、F. A. Provenzano、C. A. Boese
DOI:10.1002/jms.242
日期:2002.1
The ring opening of 1,3-di-tert-butylaziridinone by tert-butylamine and aniline was investigated by using electrospray ionization and collision-induced dissociation in an ion trap mass spectrometer in conjunction with 15N labeling of the two amine nucleophiles. Using the MSn capabilities of the ion trap instrument, we were able to monitor the retention of the 15N label through successive fragmentation steps. Both amines exhibited a remarkable degree of selectivity in that they both cleaved exclusively the 1,3-bond (the alkyl–nitrogen bond). This result is in contrast to that obtained previously with methylamine, which cleaved just the opposite bond, namely, the 1,2-bond (the acyl–nitrogen bond). These contrasting results could not have been predicted by previously published guidelines. Copyright © 2001 John Wiley & Sons, Ltd.
研究了1,3-二叔丁基氮杂环酮与叔丁胺和苯胺的开环反应,采用电喷雾电离和碰撞诱导解离在离子阱质谱仪中进行,结合对两种胺亲核试剂的15N标记。利用离子阱仪器的MSn能力,我们能够监测15N标记在连续裂解步骤中的保留。这两种胺表现出了显著的选择性,均只切断1,3-键(烷基-氮键)。这一结果与之前用甲胺获得的结果相反,甲胺恰好切断了相反的键,即1,2-键(酰基-氮键)。这些对比结果无法通过先前发布的指南进行预测。版权 © 2001 约翰·威利与儿子公司。