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Iridium-catalyzed α-selective deuteration of alcohols

The development of chemoselective C(sp(3))-H deuteration is of particular interest in synthetic chemistry. We herein report the α-selective, iridium(iii)-bipyridonate-catalyzed hydrogen(H)/deuterium(D) isotope exchange of alcohols using deuterium oxide (D(2)O) as the primary deuterium source. This m...

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Detalles Bibliográficos
Autores principales: Itoga, Moeko, Yamanishi, Masako, Udagawa, Taro, Kobayashi, Ayane, Maekawa, Keiko, Takemoto, Yoshiji, Naka, Hiroshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9350590/
https://www.ncbi.nlm.nih.gov/pubmed/35975159
http://dx.doi.org/10.1039/d2sc01805e
Descripción
Sumario:The development of chemoselective C(sp(3))-H deuteration is of particular interest in synthetic chemistry. We herein report the α-selective, iridium(iii)-bipyridonate-catalyzed hydrogen(H)/deuterium(D) isotope exchange of alcohols using deuterium oxide (D(2)O) as the primary deuterium source. This method enables the direct, chemoselective deuteration of primary and secondary alcohols under basic or neutral conditions without being affected by coordinative functional groups such as imidazole and tetrazole. Successful substrates for deuterium labelling include the pharmaceuticals losartan potassium, rapidosept, guaifenesin, and diprophylline. The deuterated losartan potassium shows higher stability towards the metabolism by CYP2C9 than the protiated analogue. Kinetic and DFT studies indicate that the direct deuteration proceeds through dehydrogenation of alcohol to the carbonyl intermediate, conversion of [Ir(III)–H] to [Ir(III)−D] with D(2)O, and deuteration of the carbonyl intermediate to give the α-deuterated product.