Transition metal catalyzed hydrogenative and transfer hydrogenative C-C bond formation
Carbon-carbon bond formation is one the fundamental reactions in organic synthesis. The quest for the development of new and more efficient processes for the construction of this bond has been an ongoing focus for years. The transformations that permit the use of simple precursors to access complex structural architectures in the absence of stoichiometric quantities by-products are highly desirable. Hydrogen is a cheapest and cleanest reductant available to the mankind. The catalytic hydrogenation has been widely utilized in the industry, however the construction of the carbon-carbon bond under hydrogenative conditions has been achieved only for alkene hydroformylations and Fisher-Tropsh process and limited to the use of carbon monoxide. The extension of the hydrogenative carbon-carbon bond formations beyond aforementioned processes would be of a great significance to the synthetic community. The overview of allene use in the metal catalyzed reactions to achieve carbonyl and imine allylation and vinylation is presented in Chapter 1. The following chapter vii discusses the development of metal catalyzed hydrogenative and transfer hydrogenative coupling of allenes and carbonyl compounds to afford allylation products. These studies have resulted in the development of the first carbonyl allylation from the alcohol oxidation level. Chapter 3 discusses efforts towards achieving highly enantioselective hydrogenative coupling of alkynes to carbonyl compounds.