Aerobic copper-catalyzed synthesis of (E)-alkenyl sulfones and (E)-β-halo-alkenyl sulfones via addition of sodium sulfinates to alkynes
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2014.01.071
日期:2014.3
(E)-alkenyl sulfones. When a CuCl catalyst was employed, the hydrosulfonylation proceeded syn-selectively, and (E)-alkenyl sulfones were synthesized in excellent yields. In contrast, the reaction using CuI catalyst produced (E)-β-haloalkenyl sulfones anti-selectively in the presence of potassium halides. Furthermore, the (E)-β-bromoalkenyl sulfones are possible to convert into various alkenyl sulfones by Suzuki–Miyaura
A stereoselective synthesis of (E)-vinyl sulfones has been developed via electrochemical oxidative N–S bond cleavage of aromatic sulfonylhydrazides, followed by cross-coupling reactions with cinnamic acids to form the C–S bond. The protocol proceeded smoothly to afford (E)-vinyl sulfones in good yields with wide substrate scope under metal-free and halogen-free conditions.
Electrochemical sulfonylation of alkenes with sulfonyl hydrazides: a metal- and oxidant-free protocol for the synthesis of (<i>E</i>)-vinyl sulfones in water
An efficient electrochemical transformation of a variety of alkenes and sulfonyl hydrazides into vinylsulfones with a catalytic amount of tetrabutylammonium iodide in water is reported. The reaction proceeds smoothly to afford vinylsulfones with good selectivities and yields at room temperature under air in an undivided cell. Cyclic voltammograms and control experiments have been performed to provide
Copper-Catalyzed Oxidative Hydrosulfonylation of Alkynes Using Sodium Sulfinates in Air
作者:Nobukazu Taniguchi
DOI:10.1055/s-0031-1290934
日期:2012.5
Copper-catalyzed hydrosulfonylations of alkynes can be carried out using sodium sulfinates in air. The procedure affords syn-selectively (E)-alkenyl sulfones in good yields. Then, both terminal and internal alkynes are available.
Decarboxylative cross-coupling reactions of cinnamic acids with sulfonylhydrazides were explored using oxygen as the sole terminal oxidant, realizing a conceptually novel technology for vinyl sulfone synthesis under the synergistic interactions of visible light irradiation, organic dye-type photocatalyst eosin Y, KI, and Cs2CO3 at room temperature.
以氧为唯一的末端氧化剂探索了肉桂酸与磺酰肼的脱羧交叉偶联反应,实现了在可见光照射,有机染料型曙红曙红Y,KI和Cs的协同作用下乙烯基砜合成的概念性新技术。在室温下为2 CO 3。