The search for exceptions in the highly enantioselective titanium catalysed oxidation of aryl benzyl sulfides
作者:Maria Annunziata M. Capozzi、Giancarlo Terraneo、Gabriella Cavallo、Cosimo Cardellicchio
DOI:10.1016/j.tet.2015.05.036
日期:2015.7
discovery of a few cases of lower enantioselectivity in the oxidation of aryl benzyl sulfides with hydroperoxides in the presence of a complex between titanium isopropoxide and (S, S)-hydrobenzoin, a screening of the oxidation of new substrates that are related to the structures that gave low ee values, was performed. From this screening, we confirmed that only a few sulfides remain as exceptions within
在发现异丙醇钛和(S,S)-氢安息香之间存在络合物的情况下,用氢过氧化物氧化芳基苄基硫醚的对映选择性较低的几种情况之后,筛选了与H2O相关的新底物的氧化反应。给出了低ee值的结构。通过该筛选,我们确认了在氧化反应的极高立体选择性的框架内,仅残留了少量硫化物。而且,可以清楚地识别出这些例外,并且这些例外与芳基上存在的特定配位部分有关。