Total Stereochemical Control in the Addition of Thiols to <i>p</i>-Toluenesulfonylacetylene. Synthesis of <i>Z</i>- and <i>E-</i>2-Sulfanylvinylsulfonyl Derivatives
作者:Rocío Medel、María I. Monterde、Joaquín Plumet、Jenny K. Rojas
DOI:10.1021/jo0402576
日期:2005.1.1
0 °C or rt without the use of any catalytic reagent to give good yields of Z-2-sulfanylvinylsulfonyl derivatives with total diastereoselectivity. On the other hand, in the presence of 1.1 equiv of NaH in THF, the same reaction affords the corresponding E-diastereomer also with total diastereoselectivity.
Selenosulfonation of acetylenes. Substitution reactions of β-(phenylseleno)vinyl sulfones with organocuprates
作者:Thomas G. Back、Scott Collins、Kwok-Wai Law
DOI:10.1016/s0040-4039(01)81145-x
日期:1984.1
β-(Phenylseleno)vinylsulfones are readily available from the selenosulfonation of acetylenes and undergo efficient, stereoselective substitution of the phenylseleno moiety by the alkyl group of alkyl (phenylseleno) cuprates.
alkenes with tosyl cyanide was discovered. Experimental investigations revealed that the reaction was initiated by the in situ formation of sulfinyl sulfone in the presence of water. The sulfinyl sulfone species decomposed to a sulfonyl radical and a sulfinyl radical through homolytic fission. The vinyl sulfone was afforded via sequential addition of the alkene to the sulfonyl radical and the sulfinyl
The Synthesis of (<i>E)‐</i>Vinyl and Alkynyl Sulfones by the Formation of an Electron Donor‐Acceptor Complex Using Thiosulfonates and Sodium Iodide Under Visible Light
作者:Kun Cao、Naiyou Zhang、Li Lin、Qing Shen、Hezhong Jiang、Jiahong Li
DOI:10.1002/adsc.202300991
日期:2024.1.30
A method for the synthesis of (E)-vinyl sulfones and alkynyl sulfones through the cleavage of thiosulfonate promoted by the formation of EDA complexes under visible light irradiation at room temperature without the need for other metal catalysts is described. The mechanism study shows that sodium iodide and thiosulfonate form EDA complexes under visible light irradiation, resulting in a single-electron
描述了一种在室温下可见光照射下通过形成EDA络合物促进硫代磺酸盐裂解合成( E )-乙烯基砜和炔基砜的方法,而不需要其他金属催化剂。机理研究表明,碘化钠和硫代磺酸盐在可见光照射下形成EDA络合物,导致单电子转移裂解生成磺酰自由基,然后与烯烃或炔烃反应,分别生成(E)-乙烯基砜或炔基砜。该方法适用于44种烯烃和炔烃底物,收率范围为38%~90%,为磺酰化化合物的制备提供了一种自由基合成途径。
<i>p</i>-Toluenesulfonylacetylene as Thiol Protecting Group