In this Minireview, the synthesis of amines by the amination of alcohols, by means of the so‐called borrowing hydrogen methodology, is presented. Compared to other synthetic methodologies for the synthesis of amines, these transformations are highly attractive because often alcohols are readily available starting materials, some of them on a large scale from renewable sources. In addition, the amination of alcohols produces water as the only by‐product, which makes the process potentially environmentally benign. Already today, lower alkyl amines are produced in bulk by the chemical industry with this synthetic method. In particular, the recent progress applying organometallic catalysts based on iridium, ruthenium, and other metals will be discussed. Notable recent achievements include the conversion of challenging substrates such as diols, the development of recyclable catalysts, milder reaction temperatures, and the direct alkylation of ammonia or its equivalents with alcohols.
Atom efficiency and selectivity are the key features of the first homogeneously catalyzed amination of secondary alcohols with ammonia to give the corresponding primary amines (see scheme). This novel amination method relies on the commercially available catalyst [Ru3(CO)12]/cataCXium PCy and does not require any additional source of hydrogen.
A novel and convenient protocol for the catalytic hydrogen-deuterium exchange of biologically active tertiary amines utilizing the borrowing hydrogen methodology has been developed. In the presence of the readily available Shvo catalyst, excellent chemoselectivity toward α- and β-protons with respect to the nitrogen atom as well as high degree of deuterium incorporation and functional group tolerance is achieved. This allowed for the deuteration of complex pharmaceutically interesting substrates, including examples for actual marketed drug compounds. Notably, this method constitutes a powerful tool for the generation of valuable internal standard materials for LC-MS/MS analyses highly demanded for various life-science applications.
Simple as that: The synthesis of aromatic amines from aliphatic amines proceeds under transfer hydrogenation conditions (see scheme). By applying the Shvo catalyst, general applicability is shown in the conversion of a variety of functionalized anilines and aliphatic amines. This base‐ and salt‐free method can be an excellent alternative to the known synthesis of anilines.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.