An efficient synthesis of N-acetyl-2-substituted indole derivatives via direct intramolecular hydroamination of N-acetyl-2-alkynylaniline derivatives was developed. The reaction could be applied to a wide range of substrates employing only 1–2 mol% of PtCl4 as the catalyst to furnish the desired indole products in moderate to excellent yields. The current protocol is efficient, reliable and scalable
for the synthesis of 2-aminobenzothiazoles by copper-catalyzedtandemreaction has been developed. In the presence of CuBr and Cs 2 CO 3 , a variety of 2-haloanilines underwent the reaction with tetramethylthiuram disulfide (TMTD) efficiently to afford the corresponding 2-aminobenzothiazoles in moderate to excellent yields. The present process allows the construction of 2-aminobenzothiazoles from a
Mild and efficient synthesis of indoles and isoquinolones<i>via</i>a nickel-catalyzed Larock-type heteroannulation reaction
作者:Wei-Zhi Weng、Jian Xie、Bo Zhang
DOI:10.1039/c8ob00795k
日期:——
A simple and efficient approach for the preparation of substituted indoles and isoquinolones via a nickel-catalyzed Larock-type heteroannulation reaction is reported. This transformation employed air-stable and inexpensive Ni(dppp)Cl2 as a precatalyst and Et3N as a mild base. Moreover, the reaction occurs efficiently under mild conditions, and a wide range of substituted indoles and isoquinolones bearing
A Highly Regioselective Synthesis of N-Acyl-2-acyl(aroyl)indolium Chloride through Palladium-Copper Catalysis Followed by Friedel–Crafts Reaction
作者:Md. Khan、Arifa Akther、Md. Alam
DOI:10.1055/s-0033-1340831
日期:——
2-Trimethylsilylethynyl acetanilides, obtained from the palladium-catalyzed reactions of 2-iodoacetanilides with trimethylsilylacetylene, underwent Friedel–Crafts acylation reactions yielding the N-acyl-2-acyl(aroyl)indolium chlorides in good yields.
Potassium carbonate-mediated tandem C–S and C–N coupling reaction for the synthesis of phenothiazines under transition-metal-free and ligand-free conditions
作者:San Wu、Wei-Ye Hu、Song-Lin Zhang
DOI:10.1039/c6ra01295g
日期:——
An efficient potassium carbonate-mediated tandem C–S and C–N coupling reaction between N-(2-iodophenyl)acetamides and 2-halo-benzenethiols has been developed. This protocol affords a simple and efficient approach for the construction of phenothiazine derivatives without the need for addition of transition-metal catalyst or ligand for the first time. Furthermore, the reaction can be easily performed