Microwave-assisted Suzuki coupling on a KF–alumina surface: synthesis of polyaryls

Suzuki cross‐coupling reaction of aryl and heterocyclic bromides and aromatic polybromides on a Pd(II)‐hydrotalcite catalyst

“…[27,28] The reaction with 1,4-dibromobenzene gives the corresponding p-terphenyl with excellent conversion and selectivity after 1 h (entry 2, Table 2); in addition, the process gives ca 9% of biphenyl by effect of a homocoupling reaction. Based on the variation of the product concentrations with time, the coupling reaction takes place in a consecutive manner, first at a bromine atom and then at the other; in fact, as can be seen from Fig.…”

Reaction of aryl di-, tri-, or tetrabromides with arylboronic acids or alkenes in the presence of a palladium-tetraphosphine catalyst

“…Similar TONs were observed in the presence of 4-fluorophenylboronic acid or 2-methylboronic acid ( Table 3, entries 4-6). Lower TONs were obtained with 1,2-dibromobenzene (entries [8][9][10][11][12].…”

“…The most popular ones are triphenylphosphine and tri(o-tolyl)phosphine, but the palladium complexes formed with these ligands are generally not very efficient in terms of substrate/catalyst ratio [6][7][8][9][10][11]. The reaction also proceeds with Pd(OAc) 2 without added ligand [12]. In recent years, the ligand P(t-Bu) 3 has also been successfully tested with these substrates [13,14].…”

Antibacterial and Antifungal Evaluation of Chloroflavones

“…However, many of these methods suffered from harsh reaction conditions, toxic reagents, strong acidic / basic conditions, prolonged reaction time, poor yield and low selectivity. Recently, microwave irradiation has gained the attention of chemists for its unique advantages, such as shorter reaction times, cleaner reaction products, higher yields and better selectivity [19][20][21]. A survey of the literature provides information that chloroflavones 6 and 7 were synthesized under microwave irradiation [22] but their biological activities were not evaluated.…”