A recyclable covalent triazine framework-supported iridium(iii) terpyridine complex for the acceptorless dehydrogenative coupling of o-aminobenzyl alcohols with ketones to form quinolines

Abstract

A cyclometalated iridium(III) complex Ir(tpy)@CTF, which is designed and synthesized by the coordinative immobilization of [Ir(tpy)Cl3] on a functionalized covalent triazing framework, was proven to be a highly effective for...

Upgrading Ethanol to n-Butanol in the Presence of Carbonate Catalyzed by a Cp*Ir Complex Bearing a Functional 2,2′-Carbonylbibenzimidazole Ligand

“…Fujita and Yamaguichi et al have designed a series of Cp*Ir complexes bearing a bipyridonate ligand or an α-hydroxybipyridine ligand, which exhibited unique catalytic activity for acceptor-less dehydrogenation of N-heterocycles and alcohols − and hydrogen production from an alcohol–water solution − based on ligand-promoted dehydrogenation. We have also reported that such complexes are general catalysts for acceptor-less dehydrogenative cyclization , and hydrogen autotransfer process − and have developed a series of new metal–ligand bifunctional catalysts. − As a continuing effort in the development of catalytic transformations, − we turn our research from organic synthesis to renewable energy. Herein, we wish to describe the design and synthesis of a new type of Cp*Ir complex bearing a 2,2′-carbonylbibenzimidazole (2,2′-COBiBzImH 2 ) ligand.…”

Accessing 2‐Aryl Quinolines via Acceptorless Dehydrogenation and Transfer Hydrogenation Under Base and Solvent‐Free Reaction Conditions

“…In the last decade, acceptorless dehydrogenation, borrowing hydrogen, and transfer hydrogenation strategies have gained popularity to overcome these challenges [15,16] . Owing to this, there are numerous reports on acceptorless dehydrogenative synthesis of quinolines utilizing homogenous catalytic system involving metals such as Co, [17] Cu, [18] Ir, [19] Fe, [20] Mn, [21] Ni, [22] Re, [23] Ru, [24] Zn, [25] and heterogeneous catalyst such as Co on C 3 N 4 , [26] CuO, [27] CuNiFeO, [28] Fe 2 O 3 , [29] CoFe 2 O 4 , [30] Ir on mesoporous silica, [31a] porous organic polymer supported Ir catalyst, [31b] covalent triazine framework supported Ir complex, [31c] Pd on polymer support [32] . However, the synthesis of quinoline via transfer hydrogenation strategy remains less explored [33–36] .…”

Iridium complex immobilized on a high-nitrogen containing covalent triazine framework derived from 2,5-pyrazinedicarbonitrile as a recyclable catalyst for the selective N-alkylation of aminobenzenesulfonamides with alcohols

“…We have developed a series of environmentally friendly transformations based on hydrogen (or deuterium) autotransfer processes 13 or acceptorless dehydrogenation. 14 In particular, we demonstrated the selective N -alkylation of aminobenzenesulfonamides with alcohols to amino-( N -alkyl)benzenesulfonamides catalyzed by a homogeneous iridium catalyst [Cp*IrCl 2 ] 2 . 15 This reaction exhibited the unique potential of hydrogen auto-transfer processes, which could recognize different types of amino groups in the N -alkylation of complex molecules.…”