A regioselective intramolecular cyclization/halogenation reaction of N-alkoxy-o-alkynylbenzamides with CuCl2/NCS was developed. The corresponding 3-(chloromethylene)isobenzofuran-1-ones were exclusively obtained via 5-exo-dig cyclization in moderate to excellent yields within 0.5-1 h. This approach has been successfully used to synthesize a biaryl compound by the Suzuki-Miyaura reaction.
Selective C–H Iodination of Weinreb Amides and Benzamides through Iridium Catalysis in Solution and under Mechanochemical Conditions
作者:Amparo Sanz-Marco、Beatriz Saavedra、Elis Erbing、Jesper Malmberg、Magnus J. Johansson、Belén Martín-Matute
DOI:10.1021/acs.orglett.3c03190
日期:2024.4.12
The acid mediated ortho-iodination of Weinrebamidesusing a readily available catalyst is described. The selective ortho-iodination of Weinrebamides, challenging substrates in directed C–H activations, and also of benzamides is achieved. The process works under mild conditions and tolerates air and moisture, having a great potential for industrial applications. The methodology can be applied under