Staff profile

Biography

Keith Andrews received his MChem from Imperial College London, including a 13 month industrial placement at GlaxoSmithKline, Stevenage, where he worked with a breakout PROTAC (proteolysis targeting chimera) development team collaborating with Prof. Craig Crews. During his MChem project with Prof. Alan Spivey, he developed a computational approach to remove systematic error in Density Functional Theory (DFT) NMR shift predictions, allowing ambiguous configurational isomers to be distinguished in a total synthesis project. He moved to start his PhD with Ross Denton at the University of Nottingham in 2013, where he developed an organocatalytic Mitsunobu reaction for the inversion of secondary alcohols, and new reductive amination methodologies using hydridosilanes, including a three-component reductive-amination-trifluoroethylation protocol. He also developed an interest in using kinetic analysis for mechanistic investigations. Keith moved to the University of Oxford for post-doctoral research with Prof. Harry Anderson FRS to learn supramolecular chemistry, templating, and host-guest recognition techniques. Here he worked on supramolecular porphyrin arrays, the synthesis of single molecule magnets, and the development of novel conjugated organic pi-systems. In 2019, he was awarded a Royal Commission 1851 Research Fellowship to begin independent work on low molecular weight enzyme mimics for catalysis and molecular recognition, hosted in the lab of Harry Anderson, and joined Linacre College as an EPA Research Fellow. In 2023 he moved to Durham to start his research group.

Research Section

Chemistry for Sustainability

Teaching

Enzyme Mimics in Organic Synthesis (Year 4 Lecture Course)

Research Interests

Enzyme Mimics 

Enzymes are the ultimate enablers of precise chemical transformations. Until recently, chemists have not had the synthetic tools to efficiently assemble 3D scaffolds such as those found in enzymes – let alone the ‘active site’, which performs the key chemistry. My research seeks to utilise supramolecular self-assembly to rapidly access tunable 3D cage scaffolds.  The challenge is to then desymmetrise these geometric scaffolds to generate specific 3D environments such as those found in enzymes. The developed synthetic cage structures will be tuned for molecular-sensing and catalysis applications, specifically those requiring a level of atomic precision and pre-organisation currently beyond the reach of small molecule tools. 

 

Soluble Robust Organic Cages 

Chemical self-assembly typically requires rigid, geometrically-matched building blocks able to undergo “self-healing” (reversible bonding) to access closed (rather than oligomeric or lattice-like) structures. Due to these constraints, the resulting structures are often highly symmetric and poorly soluble. My research seeks to develop highly soluble organic cages and methods for their desymmetrisation. The soluble cages have functional handles both inside the cavity and around the periphery, and display fascinating enzyme-like behaviour – chemical reactivity that arises from the precise arrangement of the residues around the cavity. The tunability of these cages means that, in principle, libraries of enzyme-like cavities can be synthesised. This approach, if successful, will allow goal-oriented molecular sensing (for example, using dynamic covalent combinatorial chemistry to design hosts for specific guests). We are currently working towards enzyme mimic catalysts for selective transformations of biomolecules and the degradation of polymers.

Journal Article

• Andrews, K. G., Piskorz, T. K., Horton, P. N., & Coles, S. J. (2024). Enzyme-like Acyl Transfer Catalysis in a Bifunctional Organic Cage. Journal of the American Chemical Society, 146(26), 17887-17897. https://doi.org/10.1021/jacs.4c03560
• Shields, C. E., Fellowes, T., Slater, A. G., Cooper, A., Andrews, K. G., & Szczypiński, F. T. (2024). Exploration of the polymorphic solid-state landscape of an amide-linked organic cage using computation and automation. Chemical Communications, 60(47), 6023-6026. https://doi.org/10.1039/d4cc01407c
• Andrews, K. G., Horton, P. N., & Coles, S. J. (2024). Programmable synthesis of organic cages with reduced symmetry. Chemical Science, 15(17), 6536-6543. https://doi.org/10.1039/d4sc00889h
• Adler, M. J., D’Amaral, M. C., Andrews, K. G., & Denton, R. (2023). Silyl Esters as Reactive Intermediates in Organic Synthesis. Synthesis: Journal of Synthetic Organic Chemistry, 55(20), 3209-3238. https://doi.org/10.1055/a-2083-8591
• Andrews, K. G., & Christensen, K. E. (2023). Access to Amide‐Linked Organic Cages by in situ Trapping of Metastable Imine Assemblies: Solution Phase Bisamine Recognition. Chemistry - A European Journal, 29(26), Article e202300063. https://doi.org/10.1002/chem.202300063
• Stoll, E. L., Tongue, T., Andrews, K. G., Valette, D., Hirst, D. J., & Denton, R. M. (2020). A practical catalytic reductive amination of carboxylic acids. Chemical Science, 11(35), 9494-9500. https://doi.org/10.1039/d0sc02271c
• Beddoe, R. H., Andrews, K. G., Magné, V., Cuthbertson, J. D., Saska, J., Shannon-Little, A. L., Shanahan, S. E., Sneddon, H. F., & Denton, R. M. (2019). Redox-neutral organocatalytic Mitsunobu reactions. Science, 365(6456), 910-914. https://doi.org/10.1126/science.aax3353
• Andrews, K. G., & Denton, R. M. (2017). A more critical role for silicon in the catalytic Staudinger amidation: silanes as non-innocent reductants. Chemical Communications, 53(57), 7982-7985. https://doi.org/10.1039/c7cc03076b
• Andrews, K. G., Faizova, R., & Denton, R. M. (2017). A practical and catalyst-free trifluoroethylation reaction of amines using trifluoroacetic acid. Nature Communications, 8(1), https://doi.org/10.1038/ncomms15913
• Andrews, K. G., Summers, D. M., Donnelly, L. J., & Denton, R. M. (2016). Catalytic reductive N-alkylation of amines using carboxylic acids. Chemical Communications, 52(9), 1855-1858. https://doi.org/10.1039/c5cc08881j
• Andrews, K. G., & Spivey, A. C. (2013). Improving the Accuracy of Computed 13C NMR Shift Predictions by Specific Environment Error Correction: Fragment Referencing. Journal of Organic Chemistry, 78(22), 11302-11317. https://doi.org/10.1021/jo401833b
• Andrews, K. G., Frampton, C. S., & Spivey, A. C. (2013). Structural assignment of a bis-cyclopentenyl-β-cyanohydrin formedviaalkene metathesis from either a triene or a tetraene precursor. Acta crystallographica. Section C, Crystal structure communications, 69(11), 1207-1211. https://doi.org/10.1107/s010827011302492x