InBr3-catalyzed sulfonation of indoles: a facile synthesis of 3-sulfonyl indoles
作者:J.S. Yadav、B.V.S. Reddy、A.D. Krishna、T. Swamy
DOI:10.1016/s0040-4039(03)01507-7
日期:2003.8
Indoles react smoothly with sulfonyl chlorides in the presence of a catalytic amount of indium tribromide at ambient temperature to afford the corresponding 3-arylsulfonyl indole derivatives in high yields with high regioselectivity.
Copper-Catalysed Selective 3-Sulfonylation of Indoles: A Mild Synthesis of Indolyl Sulfones
作者:Yi Du、Yunyun Liu
DOI:10.3184/174751916x14733526548948
日期:2016.10
The selective C3-sulfonylation of some 4-, 5- and 6-substituted indoles using sodium arenesulfinates as reaction partners has been realised under mild conditions using catalytic CuI/1,10-phenanthroline at 70 °C. The reaction had a satisfactory application scope and proceeded in fair to excellent yields.
In this paper, a simple and efficient protocol for the chemoselective sulfonation of indoles using aryl sulfonyl chlorides in the presence of CuI is reported. The reaction proceeds under mild conditions and is applicable to indoles bearing a selection of functional groups without NH protection.[GRAPHICS].