作者:Mikhail S. Shchepinov、Safraz Khan、Pablo L. Bernad、Vladimir A. Korshun、Edwin M. Southern
DOI:10.1055/s-2005-872703
日期:——
Synthesis of novel S-pixyls based on the thioxanthyl skeleton is described. Thioxanthone derivatives were prepared by a regioselective intramolecular Friedel-Crafts acylation reaction and converted into S-pixyl derivatives by Grignard synthesis. S-Pixyl carbocations stabilised by electron donating groups on the thioxanthyl backbone produced exceptional mass spectra under (MA)LDI conditions (laser desorption ionisation, both with and without matrix), and can be detected down to femtomol levels.
描述了基于噻吡啶骨架的新型S-匹克斯基尔的合成。通过区域选择性分子内弗里德尔-克拉夫茨酰化反应制备了噻吡啶酮衍生物,并通过格里尼亚反应转化为S-匹克斯基尔衍生物。在(MA)LDI条件下(激光解吸电离,包括有无基质),由噻吡啶主链上的电子给体基团稳定的S-匹克斯基尔碳阳离子产生了卓越的质谱,可以检测到达法摩尔水平。