Site‐Selective C(
<i>sp</i>
<sup>3</sup>
)‐H Alkenylation Using Decatungstate Anion as Photocatalyst
作者:Yi‐Ting Wang、Yi‐Lun Shih、Yen‐Ku Wu、Ilhyong Ryu
DOI:10.1002/adsc.202101374
日期:2022.3
Site-selective C(sp3)-H alkenylation was achieved under photo-irradiation in the presence of a catalytic amount of decatungstateanion, W10O324−. In this reaction, the radical addition/β-scission sequence is successfully combined with photocatalytic C(sp3)-H functionalization. The reaction using weaker C−H bonds such as those in THF revealed that the benzenesulfonyl radical itself underwent HAT directly
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
Copper-Catalyzed Decarboxylative Disulfonylation of Alkynyl Carboxylic Acids with Sulfinic Acids
作者:Hong Fu、Jia-Qi Shang、Tao Yang、Yuehai Shen、Chuan-Zhu Gao、Ya-Min Li
DOI:10.1021/acs.orglett.7b03922
日期:2018.1.19
A copper-catalyzed decarboxylative disulfonylation of alkynyl carboxylic acids with sulfinicacids in aqueous solution has been developed. The reaction provides a straightforward and practical access to (E)-1,2-disulfonylethenes, which are important building blocks in synthetic organic chemistry, and exhibits a good functional group tolerance and excellent stereoselectivity. A possible mechanism for
A novel and direct disulfonylation reaction of commercially available terminal alkynes under copper(I)/bromodifluoroacetate cocatalyst has been realized. This protocol provides a facile and practical pathway to selectively access (E)-1,2-disulfonylethenes, in which features good functional group compatibility, easily available starting materials, and excellent stereoselectivity with good yields.
RAMANA, REDDY, M. V.;RAO, NAIDU, M. S., ACTA CHIM. HUNG., 1984, 117, N 2, 153-161