Jon A Tunge
1136 GL (ISB)
1567 Irving Hill Rd
Lawrence, KS 66045
1567 Irving Hill Rd
Lawrence, KS 66045
Jon A. Tunge received a B.S. in Chemistry from the University of Idaho where he worked with Prof. Ray von Wandruszka on the development of fluorescent probes for high explosives. From 1995-2000 he worked on developing asymmetric transformations of organozirconocenes under the direction of Prof. Jack R. Norton. After receiving his Ph.D. from Columbia University in 2000, he moved to the University of Wisconsin-Madison to study the mechanisms of organometallic transformations under the guidance of Prof. Charles P. Casey. In the fall of 2002 Dr. Tunge joined the faculty at the University of Kansas , where he has established a research program combining the topics of catalytic reaction development, combinatorial chemistry, and green synthetic chemistry. He is the recipient of an NSF-CAREER Award (2005) and recently received a W. T. Kemper Fellowship for Teaching Excellence.
With natural resources dwindling, it is imperative that new synthetic methods are developed that provide highly useful chemical building blocks, proceed in high yield and selectivity, yet generate little waste. Catalyst development, such as that being conducted in the Tunge group, will play an essential role in approaching this challenge. The ongoing research in the Tunge laboratory is focused on developing mild, waste-free, catalytic methods that facilitate the synthesis of usefull small molecules. In addition, they are engaged in detailed mechanistic studies of catalytic processes with the goal of advancing the fundamental knowledge of the chemical sciences. Thus, research projects in the Tunge group span several traditional disciplines with catalysis as the central theme. In particular we are interested in the application of the principles of catalysis toward selective synthesis of biologically active small molecules, combinatorial synthesis, and potential large-scale production of fine chemicals. Currently, a major research thrust of the Tunge group is the development of environmentally friendly methods for cross-coupling reactions. While catalytic cross-coupling reactions have made a significant positive impact in the synthesis of chemically-complex small molecules and natural products, such reactions typically require expensive, toxic, or highly basic reagents. Moreover, these reagents produce stoichiometric quantities of hazardous byproducts that are often difficult to remove from the product. With this in mind, the Tunge group is developing catalytic synthetic methods that capitalize on CO2 release as a driving force for the formation of reactive organometallics intermediates. This strategy utilizes ubiquitous carboxylic acids as substrates and avoids the use of expensive, toxic, or highly basic reagents. Ultimately, decarboxylative coupling allows access to a wide variety of useful organic molecules using an environmentally benign method. In addition to decarboxylative coupling, the Tunge group is investigating the functionalization of arene C-H bonds to provide products analogous to those produced by well-known cross coupling reactions. Like decarboxylative metalation, such a strategy avoids expensive and/or toxic reagents and minimizes the production of hazardous waste. Since C-H bond functionalization obviates the formation of byproducts, it is ideally suited for combinatorial chemistry, where the purification of large chemical libraries by traditional methods is not feasible. These strategies are being applied to the parallel synthesis of libraries of privileged biological scaffolds such as coumarins and chromans in conjunction with the KU Center for Chemical Methodologies and Library Development (http://www.cmld.ku.edu/) . Through this exciting collaborative effort, compounds in our chemical libraries have been shown to inhibit processes implicated in diseases including leishmania, tuberculosis, and hepatitis C. Lastly, we have partnered with Prof. Bala Subramaniam and the KU Center for Environmentally Beneficial Catalysis (CEBC) to develop homogeneous recyclable rhodium catalysts. The soluble supported catalysts are effective for the hydroformylation of olefins in environmentally benign CO2-expanded solvents. Moreover, our catalysts are effective for many rhodium-catalyzed coupling reactions including hydroarylations of olefins and aldehydes as well as activation of alkynes toward conjugate addition to unsaturated aldehydes and ketones. Thus, we have developed efficient supported catalysts that can be readily recycled via simple precipitation and filtration or by continuous membrane filtration.
- applications of catalysis to asymmetric synthesis
- combinatorial synthesis
- functionalization of biomass
Selected Publications —
Tunge, Jon A, Simon B Lang, and Theresa M Locascio. “Activation of Alcohols with Carbon Dioxide: Intermolecular Allylation of Weakly Acidic Pronucleophiles.” Journal Articles. Organic Letters 16 (2014): 4308–11.
Tunge, Jon A, and Tapan Maji. “Catalytic Alpha-Monoallylation of Aryl Acetonitriles.” Journal Articles. Organic Letters 16 (2014): 5072–75.
Tunge, Jon A, Simon B Lang, and Kathryn M O’Nele. “Decarboxylative Allylation of Amino Alkanoic Acids and Esters via Dual Catalysis.” Journal Articles. Journal of the American Chemical Society 136 (2014): 13606–9.
Tunge, Jon A, and Yamuna Ariyarathna. “Decarboxylative Allylations of Ester Enolate Equivalents.” Journal Articles. Organic and Biomolecular Chemistry, no. 12 (2014): 8386–89.
Tunge, Jon A, and Yamnuna Ariyarathna. “Multicomponent Decarboxylative Allylations.” Journal Articles. Chemical Communications, no. 50 (2014): 14049–52.
Tunge, Jon A, Kinthada Ramakumar, and Tapan Maji. “Retro-Claisen Benzylation: Direct Use of Benzyl Alcohols in Pd-Catalyzed Couplings with Nitriles.” Journal Articles. Chemical Communications, no. 50 (2014): 14045–48.
Tunge, Jon A, and Kinthada Ramakumar. “Synthesis of N-Aryl-1-Aminoindoles via Intermolecular Redox Amination.” Journal Articles. Chemical Communications 50 (2014): 13056–58.
Grants & Other Funded Activity —
Sustainable chemical innovations by an integrated design approach. NSF1339661. National Science Foundation and Environmental Protection Agency. $2200000.00. (9/1/2013 - 9/30/2017). Federal. Status: Funded