Blue LED Light and Textbook Chemistry Enable Two-for-One Carbon Modification, Accelerating Complex Drug Synthesis
核心洞察
University at Buffalo chemists developed a method using blue LED light and a photocatalyst to modify two adjacent carbon atoms in a single reaction instead of the usual one.
The technique uses off-the-shelf blue LEDs and commercially available carbon-halogen bond building blocks familiar from undergraduate organic chemistry.
Visible light offers a milder alternative to UV light, reducing the risk of degrading sensitive organic molecules during synthesis.
A research team led by the University at Buffalo has demonstrated that blue LED lights—the same kind used in indoor gardens and fish tanks—can dramatically streamline the synthesis of complex small-molecule drug candidates. Published July 9 in Science, the study shows how visible light, a commercially available photocatalyst, and carbon-halogen bond chemistry can modify two adjacent carbon atoms in a single reaction, effectively doubling the efficiency of a classic organic transformation.
“We’ve used the relatively mild conditions of visible light to expand what chemists can do with a longtime organic chemistry staple,” said corresponding author Patricia Z. Musacchio, PhD, assistant professor of chemistry in the UB College of Arts and Sciences. “We hope this gives chemists a faster route to the complex molecules needed in drug discovery.”
Two Modifications from a Single Reaction
Carbon atoms form the backbone of most small-molecule drugs. By altering the groups attached to these carbon atoms, medicinal chemists can tune a drug’s shape, potency, and selectivity. Molecules containing carbon-halogen bonds have long served as versatile starting points because the halogen atom can be readily removed and replaced with another group—a reaction taught in undergraduate organic chemistry courses.
Traditionally, this substitution modifies only the carbon atom that bore the halogen; the neighboring carbon remains untouched. The new method changes that paradigm. When the researchers mixed carbon-halogen building blocks with a light-activated catalyst and illuminated the mixture with blue LED light, the catalyst temporarily transformed the molecules into more reactive forms. This opened a window for adding new groups of atoms to the neighboring carbon as well.
“The advantage is getting two modifications from a single reaction, whereas you normally only get one modification,” said co-corresponding author Jennifer Hirschi, PhD, associate professor of chemistry at Binghamton University. “More changes in fewer steps is crucial when creating small-molecule drugs.”
Gentler Chemistry with Visible Light
Musacchio’s laboratory houses shelves of small compartments the team calls “Buffalo boxes,” each equipped with blue LEDs. Inside these boxes, the light activates the catalyst in each vial, initiating the dual-modification reaction. Using visible light represents a significant advantage over traditional photochemical methods that rely on higher-energy ultraviolet (UV) light.
“UV light could degrade or decompose the organic molecules that we're making, so the visible light is a much more mild approach,” Musacchio explained.
Toward More Complex Drug Targets
The researchers envision the approach being adapted for other types of molecular transformations beyond the carbon-halogen system. The team plans to collaborate with pharmaceutical companies to explore how the method can be tailored to specific drug targets.
“The hope is to not only make drugs faster, but also make more complex drugs that can target more challenging medicinal goals,” Musacchio said.
The study was conducted in collaboration with Worcester Polytechnic Institute, where Musacchio previously worked, and Binghamton University. It was supported by the National Institute of General Medical Sciences, part of the National Institutes of Health, and the National Science Foundation ACCESS program. Additional co-authors include David Watson, professor in the UB Department of Chemistry, and UB chemistry graduate students Yufei Zhang, Hammed Bisiriyu, Alon Nudler, and Benjamin Parasch.