1140737-91-2Relevant academic research and scientific papers
Remarkably Efficient Iridium Catalysts for Directed C(sp2)-H and C(sp3)-H Borylation of Diverse Classes of Substrates
Chattopadhyay, Buddhadeb,Hassan, Mirja Md Mahamudul,Hoque, Md Emdadul
supporting information, p. 5022 - 5037 (2021/05/04)
Here we describe the discovery of a new class of C-H borylation catalysts and their use for regioselective C-H borylation of aromatic, heteroaromatic, and aliphatic systems. The new catalysts have Ir-C(thienyl) or Ir-C(furyl) anionic ligands instead of the diamine-type neutral chelating ligands used in the standard C-H borylation conditions. It is reported that the employment of these newly discovered catalysts show excellent reactivity and ortho-selectivity for diverse classes of aromatic substrates with high isolated yields. Moreover, the catalysts proved to be efficient for a wide number of aliphatic substrates for selective C(sp3)-H bond borylations. Heterocyclic molecules are selectively borylated using the inherently elevated reactivity of the C-H bonds. A number of late-stage C-H functionalization have been described using the same catalysts. Furthermore, we show that one of the catalysts could be used even in open air for the C(sp2)-H and C(sp3)-H borylations enabling the method more general. Preliminary mechanistic studies suggest that the active catalytic intermediate is the Ir(bis)boryl complex, and the attached ligand acts as bidentate ligand. Collectively, this study underlines the discovery of new class of C-H borylation catalysts that should find wide application in the context of C-H functionalization chemistry.
Directed ortho borylation of phenol derivatives catalyzed by a silica-supported iridium complex
Yamazaki, Kenji,Kawamorita, Soichiro,Ohmiya, Hirohisa,Sawamura, Masaya
supporting information; experimental part, p. 3978 - 3981 (2010/10/21)
The directed ortho borylation of phenol derivatives protected with an N,N-diethylcarbamoyl group was efficiently catalyzed by an immobilized monophosphine-Ir system, which was prepared in situ from [Ir(OMe)(cod)] 2 and a silica-supported, compact phosphine. The utility of the carbamoyloxy group as a leaving group for metal-catalyzed cross-coupling reactions was demonstrated by its utilization in the synthesis of a terphenyl derivative.
NOVEL CYCLIC BORONATE INHIBITORS OF HCV REPLICATION
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Page/Page column 90, (2009/05/29)
Compounds of formula (I) or a salt thereof are provided; wherein R1, R2, R3, R4, R6, R8, R20, R30, Y, Z and n are as defined in the description. Uses of the compounds as medicaments, and in the manufacture of medicaments for treating viral infection, especially HCV infection are also disclosed. The invention further comprises processes to make these compounds and pharmaceutical formulations thereof.
