Iridium- and rhodium-catalyzed C–H activation and formyl arylation of benzaldehydes under chelation-assistance
作者:Xifa Yang、He Wang、Xukai Zhou、Xingwei Li
DOI:10.1039/c6ob00825a
日期:——
Mild and efficient synthesis of benzophenones via Ir(iii)- and Rh(iii)-catalyzed, directing group-assisted formyl C–H arylation of benzaldehydes has been achieved using diaryliodonium salts, in which Rh(iii) and Ir(iii) catalysts exhibited a complementary substrate scope.
Eco-friendly organocatalyst- and reagent-controlled selective construction of diverse and multifunctionalized 2-hydroxybenzophenone frameworks for potent UV-A/B filters by cascade benzannulation
作者:Muhammad Saeed Akhtar、Raju S. Thombal、Ramuel John Inductivo Tamargo、Won-Guen Yang、Sung Hong Kim、Yong Rok Lee
DOI:10.1039/d0gc01011a
日期:——
2-hydroxy-3′-formylbenzophenones and [4 + 2] cycloaddition for 2-hydroxybenzophenones. With this methodology, an unprecedented double benzannulation allows one-pot construction of diverse 7-(2′-hydroxybenzoyl)-2-naphthaldehydes via [3 + 3 + 4] cycloaddition. This protocol features a broad substrate scope, high functional-group tolerance, and operational simplicity in an environmentally benign green solvent
A peroxide-free methodology was developed for the synthesis of benzoylated naphthol/phenol derivatives through oxidative deamination reaction performed under aerobic reaction conditions. A synergistic combination of Cu(OTf)2 and Ag2O was used to convert the aminonaphthols and aminophenols to the corresponding benzoylated derivatives. The definite role of atmospheric oxygen to assist the reaction was
Divergent reaction: metal & oxidant free direct C–H aryloxylation and hydride free formal reductive N-benzylation of N-heterocycles
作者:Sujit Mahato、Md Ashraful Haque、Soumita Dwari、Chandan K. Jana
DOI:10.1039/c4ra05045b
日期:——
Metal, oxidant and other additive-free novel methods for direct C–H aryloxylation of aliphatic amines are developed. In the presence of excess amine, the course of the reaction was diverted, producing various arylmethylamines via hydride-free formal reductive amination. Involvement of a quinonemethideintermediate was revealed from mechanistic studies.