Abstract: Asymmetric catalysis has advanced rapidly as a discipline as a result of powerful modalities. Transition metal complexes, organocatalysts and enzymes have all played critical roles. Probably critical from the start, and in all three of these approaches to the field, noncovalent interactions are now appreciated to play a decisive role as determinants of selectivity. Peptide-based catalysts have proven to be a central platform for the systematic study of noncovalent interactions as determinants of selectivity in a wide variety of reactions. Design of new catalyt
Abstract: This seminar will describe our investigations into how organic radical ions–typically thought of as fleeting intermediates–can be tamed and exploited as a new family of organocatalysts and small molecule reagents. We identified selective generation of such species as a key hurdle stymying development of these systems. To address this problem, we have leveraged electrochemistry to develop new synthetic transformations driven by organic radical ions.
Abstract: This lecture will describe recent developments in our efforts to develop catalysts for asymmetric reactions, in particular for the preparation of densely functionalized, stereochemically complex structures. Over time, our foci have been on enantioselectivity, site-selectivity and chemoselectivity. In much of our current work, we are studying issues of enantioselectivity as a prelude to the extrapolation of catalysis concepts to more complex molecular settings where multiple issues are presented in a singular substrate. Complex natural product, for example, will