Ring-Closure Reactions through Intramolecular Displacement of the Phenylselenonyl Group by Nitrogen Nucleophiles: A New Stereospecific Synthesis ofN-Tosyl andN-Benzoyl-1,3-oxazolidin-2-ones fromβ-Hydroxyalkyl Phenyl Selenides
作者:Marcello Tiecco、Lorenzo Testaferri、Andrea Temperini、Luana Bagnoli、Francesca Marini、Claudio Santi
DOI:10.1002/chem.200305497
日期:2004.4.2
3-oxazolidin-2-ones from the easily available beta-hydroxyalkyl phenyl selenides is presented. After transformation into the N-tosyl or N-benzoyl carbamates, the selenides were oxidized to the corresponding selenones. The key step of the process is the ring-closure reaction, which occurs by stereospecific intramolecular nucleophilic substitution of the selenone group by the nitrogen atom of the carbamate. Enantiomerically
提出了一种新的方便的方法,用于从容易获得的β-羟烷基苯基硒化物立体定向合成各种取代的1,3-恶唑烷-2-酮。在转变成N-甲苯磺酰基或N-苯甲酰基氨基甲酸酯之后,硒化物被氧化成相应的硒酮。该过程的关键步骤是闭环反应,该反应是通过氨基甲酸酯的氮原子对硒酮基团进行立体特异性分子内亲核取代而发生的。通过使用对映体纯的β-羟烷基苯基硒化物作为起始原料,可以容易地制备对映体纯的1,3-恶唑烷-2-酮衍生物。