Hydrosilanes Are Not Always Reducing Agents for Carbonyl Compounds but Can Also Induce Dehydration: A Ruthenium-Catalyzed Conversion of Primary Amides to Nitriles
A practical procedure for production of nitriles is offered by the triruthenium carbonyl cluster catalyzed dehydration of primary carboxamides with hydrosilanes under neutral conditions. This is the first example that a transition-metal-catalyzed activation of Si–H bonds does not lead to the reduction of carbonyl compounds but to dehydration. Possible mechanisms for the dehydration is discussed on
halosilanes was catalysed by iridiumamidocomplexes to produce hydrosilanes. Selective monohydrogenolysis of di- and trichlorosilanes similarly proceeded, resulting in the formation of chlorohydrosilanes (R2SiHCl or RSiHCl2) as synthetically important building blocks for various organosilicon compounds. A mechanistic study supported the in-situ formation of an iridium hydride species as a key intermediate
Direct and Regioselective Introduction of Acetals into Imidazoles at the 2-Position by an Iridium-Catalyzed Reaction with Formates in the Presence of Hydrosilanes
作者:Yoshiya Fukumoto、Yasuaki Iyori、Naoto Chatani
DOI:10.1002/ejoc.201700125
日期:2017.3.27
of imidazoles with formates in the presence of hydrosilanes as co-reactants, leading to the production of 2-[(alkoxy)(siloxy)methyl]imidazoles, is described. Dimethyl acetylenedicarboxylate (DMAD) was the additive of choice for the reaction, in terms of reaction efficiency. No reaction was observed in the absence of the hydrosilanes. While substituents at the 1- and 5-positions on the imidazole ring
The catalytic reduction of alkoxysilanes with the borane HBpin (pin = pinacolato) was achieved using a metallocene-type yttrium complex as a catalyst precursor. Mechanistic study supported the pivotal role of the rigid metallocene structure of the catalyst, which bears two bulky η5-C5Me4SiMe3 ligands, in suppressing the coordination of the side product MeOBpin that is generated during the reaction