Sodium Dithionite‐Mediated Decarboxylative Sulfonylation: Facile Access to Tertiary Sulfones
作者:Yaping Li、Shihao Chen、Ming Wang、Xuefeng Jiang
DOI:10.1002/anie.202001589
日期:2020.6.2
A straightforward multicomponent decarboxylative cross coupling of redox-active esters (N-hydroxyphthalimide ester), sodium dithionite, and electrophiles was established to construct sterically bulky sulfones. The inorganic salt sodium dithionite not only served as the sulfur dioxide source, but also acted as an efficient radical initiator for the decarboxylation. Notably, diverse naturally abundant
建立了氧化还原活性酯(N-羟基邻苯二甲酰亚胺酯),连二亚硫酸钠和亲电试剂的直接多组分脱羧交叉偶联,以构建体积庞大的砜。无机盐连二亚硫酸钠不仅用作二氧化硫源,而且还用作脱羧的有效自由基引发剂。值得注意的是,具有多种杂原子和敏感官能团的各种天然丰富的羧酸和人工制备的含羧基药物成功地进行了这种脱羧磺酰化反应,从而提供了体积庞大的叔砜。机理研究进一步表明,脱羧是决定速率的步骤,是在连二亚硫酸钠的帮助下通过单电子转移(SET)过程发生的。