Acid-mediated sulfonylation of arylethynylene bromides with sodium arylsulfinates: synthesis of (E)-1,2-bis(arylsulfonyl)ethylenes and arylacetylenic sulfones
A solvent-dependent sulfonylation of arylethynylene bromides with sodium arylsulfinates has been developed. The (E)-1,2-bis(arylsulfonyl)ethylenes were formed in DMSO, while the arylacetylenic sulfones were obtained in toluene. Utilizing simple and readily available starting materials, the sulfonylation products were generated with good selectivities and yields without the need for a metal catalyst
A method for producing a biaryl compound represented by the formula (2)
Ar—Ar (2)
wherein Ar represents an aromatic group which can have a substituent, comprising conducting a coupling reaction of a compound represented by the formula (1)
Ar—Cl (1)
wherein Ar represents the same meaning as defined above, in the presence of copper metal and a copper salt.
Iodine-catalyzed synthesis of sulfonyl isoxazoles from sodium sulfinates and isoxazol-5(4H)-ones
作者:Dong Tang、Zafar Iqbal、Jian Sun、Jingwen Ji、Minghua Yang、Zhixiang Yang
DOI:10.1016/j.tetlet.2020.152685
日期:2021.1
An efficient I2-mediated sulfonylation at 4-position of isoxazoles has been developed by employing sodium sulfinate and 3-substituted isoxazol-5(4H)-ones. This metal-free, one-pot strategy provides various sulfonyl isoxazoles under mild reaction conditions. The final product exists in the form of stable organic sodium salt, which can be purified by column chromatography under air.
here. This strategy enables the enantioselective construction of chiral allylic sulfones from simple α-chlorosulfones and vinyl bromides. The mild reaction conditions lead to excellent functional group compatibility, as evidenced by the broad substrate scope and tolerance of complex bioactive molecules. Our preliminary mechanistic study suggests that this enantioselective vinylation process operates through
Thermoformable, thermosettable resins essentially free of secondary alcohol groups are obtained by reaction of oxiranes in active hydrogen-free epoxies with carboxylate or carbonate groups in active hydrogen-free aryl polyesters, polycarbonates or copolyestercarbonates in the presence of catalytically effective amounts of certain polyorgano phosphonium or phosphine imminium salts.