Síntese de Teluretos de Diarila Simétricos via Catálise de Prata

Abstract

In this work, a simple and efficient method was developed for the synthesis of different symmetrical diaryl tellurides 3a-n, through the reaction between aryl boronic acids 1a-n and Te0 2. This method used 10 mol% of silver nitrate as a catalyst, DMSO as solvent, temperature of 120 °C for a time of 5-24 h, depending on the substrate (Scheme 1). Highlighting that this is the first report for obtaining symmetrical diaryl tellurides using silver catalysis through the reaction between the substrates above described. After optimizing the reaction conditions, we study the versatility of the method varying several aryl boronic acids 1a-n. Reactions were carried out with different substituents in the ortho, meta and para positions in the aromatic ring of aryl boronic acids 1, obtaining the diaryl tellurides 3 replaced by electron donating and withdrawing groups, as well as a naphthyl group. It was possible to obtain satisfactory results for 14 examples, with yields that varied from 25% to 85% in a period of 5-24 hours.