practical synthesis of electrophilic sulfenylating reagents, thiosulfonates and disulfides, from inexpensive and easily available sulfonyl chlorides, has been developed. By appropriate choice of solvents, the reaction of sulfonyl chlorides and tetrabutylammonium iodide gave the target products in good to excellent yields, respectively. These transformations probably proceed through a reducing–coupling
作者:Vincent Pirenne、Gülbin Kurtay、Silvia Voci、Laurent Bouffier、Neso Sojic、Frédéric Robert、Dario M. Bassani、Yannick Landais
DOI:10.1021/acs.orglett.8b01828
日期:2018.8.3
Eosin-Y (EY)-mediated alkylsulfonyl cyanation of olefins was shown to afford alkylsulfonyl nitriles in good yields. On the basis of transient absorption spectroscopy, the reaction was shown to proceed via photoinduced electron transfer from 3EY* to an O-cyanated derivative of the photocatalyst, formed in situ, with generation of the corresponding sulfinate that is oxidized by EY•.+ into a sulfonyl
曙红-Y(EY)介导的烯烃烷基磺酰基氰化反应显示出可提供高收率的烷基磺酰基腈。根据瞬态吸收光谱法,反应通过光致电子从3 EY *转移至原位形成的光催化剂的O氰化衍生物而进行,并生成了被EY •氧化的亚磺酸盐。变成磺酰基。将后者加到烯烃上,然后进行自由基氰基基团转移,然后将腈与维持自由基链的RSO 2自由基一起提供。
Oxidation of Thiols with IBX or DMP: One-Pot Access to Thiosulfonates or 2-Iodobenzoates and Applications in Functional Group Transformations
作者:Ajeet Chandra、Navin Yadav、Soumen Payra、Keshaba N. Parida
DOI:10.1021/acs.orglett.3c02017
日期:2023.9.1
o-Iodoxybenzoic acid (IBX) and Dess–Martin periodinane (DMP) are employed for thiol to thiosulfonate conversion at rt. DMP is better than IBX in terms of reaction rate, conversion, and required equivalents. IBX-mediated oxidation of benzyl thiols produced thiosulfonates, whereas DMP afforded O-benzyl esters. The one-pot conversion of a thiol to an ester is unprecedented; this atom-economic transformation
enabled by the electron donor–acceptor complex has been developed under light illumination at roomtemperature. The approach offers a convenient and environmentally friendly route for the simultaneous incorporation of Csp3–Rf and Csp3–S bonds, affording valuable polyfunctionalized alkane derivatives containing fluorine and sulfur in satisfactory yields. Consequently, this methodology holds significant value