Efficient synthesis of triarylmethanes via bisarylation of aryl aldehydes with arenes catalyzed by silica gel-supported sodium hydrogen sulfate

One-Pot Three-Component Coupling of Arylhydrazines with Aryl Aldehydes to Access the Triarylmethane Scaffold

We herein report a one-pot, three-component coupling of arylhydrazine HCl salts with aryl aldehydes to synthesize a triarylmethane scaffold. This reaction proceeds under simple, mild, and practical conditions without the need for an additional Bro̷nsted or Lewis acid additive, accommodating a broad substrate scope with good to excellent yields. Furthermore, this methodology can be scaled up and allows access to a diverse range of triarylmethane derivatives. Mechanistic studies suggest that the in situ formed hydrazone intermediate is essential for the high efficiency and selectivity of this transformation.

HFIP-Mediated Dual C(Ar)-Alkylation Process Towards the Regioselective Synthesis of Triarylmethanes (TRAMs)

The distinct roles of different chemical species are essential for the discovery of novel chemical transformations in organic synthesis. Here, we have designed a potential strategy for the synthesis of triarylmethanes (TRAMs) using the dual C(aryl)-alkylation process. This protocol was influenced by 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) as a pivotal reagent and proceeds through the selective para C-H functionalization method. The described approach has been proven to be highly efficient in terms of substrate scope with excellent functional group tolerance and gram scale synthesis of the desired product with 90 % yield. The recyclability and reusability of HFIP has enhanced the feasibility of this protocol towards the sustainable synthesis of TRAMs.

Metal- and solvent-free synthesis of aniline- and phenol-based triarylmethanes via Brönsted acidic ionic liquid catalyzed Friedel-Crafts reaction

A beneficial, scalable and efficient methodology for the synthesis of aniline-based triarylmethanes has been established through the double Friedel-Crafts reaction of commercial aldehydes and primary, secondary or tertiary anilines using Brönsted acidic ionic liquid as a powerful catalyst, namely [bsmim][NTf2]. This protocol was successfully performed under metal- and solvent-free conditions with a broad range of substrates, giving the corresponding aniline-based triarylmethane products in good to excellent yields (up to 99%). In addition, alternative aromatic nucleophiles such as phenols and electron-rich arenes were also studied using this useful approach to achieve a diversity of triarylmethane derivatives in high to excellent yields.

Synthesis of new mixed-bistriarylmethanes and novel 3,4-dihydropyrimidin-2(1H)one derivatives

Formylated-triarylmethanes were realized as ideal precursors for the design and synthesis of mixed-bistriarylmethanes and 3,4-dihydropyrimidin-2(1H)one-triarylmethane hybrid derivatives.

Synthetic methodologies of achiral diarylmethanols, diaryl and triarylmethanes (TRAMs) and medicinal properties of diaryl and triarylmethanes-an overview

This review covers the synthesis of achiral diarylmethanols, diaryl and triarylmethanes and the bioactivities of diaryl and triarylmethanes during 1995 to 2013.