Wednesday, October 7, 2026 - 4:00pm

The synthesis of complex natural products often provides opportunities for the discovery of new reactions and concepts that find application well beyond the original synthetic objective. Such was our experience during studies directed toward the ambiguine alkaloids, a structurally intricate subgroup of the hapalindole family of natural products. While these efforts culminated in concise syntheses of several ambiguines, they also revealed the need for a more efficient preparation of a key synthetic intermediate. The search for such a solution led us to reexamine the relatively unexplored chemistry of organobismuth compounds and ultimately to the design of conformationally constrained organobismuth reagents that function as reusable aryl transporters. In this presentation, I will describe how this unexpected journey has evolved into a broader investigation of organobismuth chemistry, leading to practical solutions for several longstanding challenges in organic synthesis, including the general -arylation of carbonyl compounds and concise, regiocontrolled synthesis of indoles from simple carbonyl precursors. Collectively, these studies illustrate how the pursuit of an "ideal" synthesis can inspire new directions in synthetic methodology and expand the synthetic toolbox available to chemists.

Speaker: 

Viresh Rawal

Institution: 

University of Chicago

Location: 

RH 104
Viresh Rawal