作者:Stuart C. Davidson、Gabriel dos Passos Gomes、Leah R. Kuhn、Igor V. Alabugin、Alan R. Kennedy、Nicholas C.O. Tomkinson
DOI:10.1016/j.tet.2020.131784
日期:2021.1
Treatment of a sulfide with a catalytic amount of a 1,3-diketone in the presence of silica sulfuric acid as a co-catalyst and hydrogen peroxide (50% aq) as the stoichiometric oxidant leads to the corresponding sulfoxide product. The reaction is effective for diaryl, aryl-alkyl and dialkyl sulfides and is tolerant of oxidisable and acid sensitive functional groups. Investigations have shown that the
在二氧化硅硫酸作为助催化剂和过氧化氢(50%aq)作为化学计量氧化剂的存在下,用催化量的1,3-二酮处理硫化物,得到相应的亚砜产物。该反应对于二芳基,芳基烷基和二烷基硫化物是有效的,并且对可氧化的和酸敏感的官能团具有耐受性。研究表明,在酸性反应条件下,戊烷-2,4-二酮与过氧化氢反应生成的三过氧化物2可使用环外过氧化物基团氧化两当量的硫化物,而环内过氧化物则保持完整。计算提供了与实验观察结果一致的机制,并表明反应通过氧转移到硫亲核试剂之前,质子化的三过氧化物的初始酸催化开环。