A synthetic method is presented for S−N bond formation starting from cheap and affordable materials. We show that (un)substituted N-protected cyclic eight-membered C2-symmetric sulfenamides have been prepared in a few steps using this procedure. The syntheticutility of these ambipolar derivatives was demonstrated in a variety of synthetic transformations affording different S,N-heterocyles of pharmaceutical
A New Paradigm for Carbon−Carbon Bond Formation: Aerobic, Copper-Templated Cross-Coupling
作者:Janette M. Villalobos、Jiri Srogl、Lanny S. Liebeskind
DOI:10.1021/ja074931n
日期:2007.12.1
Thiol esters and boronic acids react to produce ketones under aerobic conditions in the presence of catalytic quantities of a CuI or CuII salt. The reaction occurs at reasonable rates between room temperature and 50 degrees C at neutral pH using thiol esters derived from bulky 2 degrees amides of thiosalicylamides such as those based on N-tert-butyl-2-mercaptobenzamide. In this mechanistically unprecedented
Palladium-Catalyzed Desulfonative Carbonylation of Thiosulfonates: Elimination of SO<sub>2</sub> and Insertion of CO
作者:Jian-Xing Xu、Le-Cheng Wang、Xiao-Feng Wu
DOI:10.1021/acs.orglett.2c01951
日期:2022.7.8
A palladium-catalyzed desulfonative carbonylation of thiosulfonates has been explored. Without any additive, a series of S-aryl/alkyl benzenesulfonothioates were successfully transformed to thioesters in moderate to excellent yields by SO2 extrusion and CO insertion under the pressure of 1 bar of CO. The solvent dimethylacetamide (DMAc) facilitated this desulfonative carbonylation due to its high absorbing
已经探索了硫代磺酸盐的钯催化的脱磺羰基化。在不使用任何添加剂的情况下,在 1 bar CO 的压力下,通过 SO 2挤出和 CO 插入,一系列S-芳基/烷基苯硫代磺酸盐成功地转化为硫酯,产率适中。对SO 2的高吸收能力。
Photocatalytic Phosphine-Mediated Thioesterification of Carboxylic Acids with Disulfides
Herein, a practical and effective synthesis of thioesters from readily available carboxylic acids and odorless disulfides was developed under photocatalytic conditions. This approach involves phosphoranyl radical-mediated fragmentation to generate acyl radicals and allows for incorporation of both S atoms of the disulfides into the desired products. In addition to batch reactions, a continuous-flow
Metal-Free Synthesis of Benzothiazoles from Disulfides of 2-Aminobenzenethiol and Carboxylic Acid via PCl3-Promoted Tandem Reaction
作者:Ning Zhu、Guangyan Du、Limin Han、Hailong Hong、Quanling Suo
DOI:10.3987/com-15-13256
日期:——
A metal-free process for the synthesis of benzothiazoles via PCl3-promoted cleavage/acylation/cyclization of disulfides and carboxylic acids has been developed. In addition to acting as the acylating reagent which converted carboxylic acids into acyl chlorides, PCl3 also converted disulfides to thiols, which promoted disulfides of 2-aminobenzenethiol reacted with carboxylic acid to produce benzothiazoles. The developed method is applicable to a wide range of carboxylic acids containing different functional groups.