Prof. Patrick G. Steel
(email at email@example.com)
The Steel group has a broad spread of interests ranging from the development and applications of new methods for organic synthesis to the design and synthesis of small molecule probes and modulators (inhibitors) of biological processes to applications in applied synthetic biology. The work is supported by both the research councils (EPSRC, BBSRC, MRC) and industry (Syngenta, GSK, AZ, Pfizer, Lilly)
Synthesis and Application of Boronic Acids
Aryl and heteroaryl boronate esters are very important organic intermediates in organic synthesis that have been deployed in many useful transformations including the Suzuki–Miyaura cross-coupling reactions, Cu-catalyzed C-O and C-N coupling reactions, and conjugate additions to carbonyl compounds. As a result there is a need for efficient methods to prepare them. We have been studying the iridium catalyzed direct borylation of C-H and C-X bonds as a powerful route to these compounds. A particular current interest is in developing strategies for the preparation of basic heterocyclic boronic acid which are more challenging to prepare but are of vital importance for the pharmaceutical and agrochemical industries. Other goals include included the development of sequential chemistries in which borylation is combined with a second transformation, the design of better ligand sets to control regiochemistry and the development of faster, more effective catalysts using cheaper metals such as copper and zinc. Throughout all of this we collaborate closely with Todd Marder (Würzburg) and also with other chemists elsewhere including Profs Zenyang Lin (Hong Kong) and Lei Lui (Beijing).
We have a longstanding interest in the chemistry of low-coordination silicon compounds as applied to organic synthesis. Owing to their transient existence, such π-bonded silicon compounds have primarily been the subject of research into fundamental aspects of structure and reactivity with little attempt to explore their potential in organic synthesis. We have been particularly interested in studying the cycloaddition chemistry of silenes (compounds with a silicon carbon double bond). These prove to be powerful reagents for stereocontrolled alkene functionalization and we have used this methodology in the synthesis of novel heterocycles and natural products. A current challenge is to develop methods which provide access to the silene under milder catalytic conditions to increase the functional group tolerance of this approach. Much of this chemistry is undertaken in collaboration with groups Europe notably Prof. Henrik Ottosson at Uppsala University in Sweden.
We are engaged in a number of projects that fall under the broad umbrella of chemical biology. In all of these a key goal is an understanding of how biological processes and the interactions between biological target and the small molecule are occurring at a molecular level. Much of this work is undertaken in collaboration in which group member move seamless between chemistry and biology groups learning skill in both disciplines. We have a particular interest in plant and parasite chemical biology.
In plant chemical biology we have developed close links with groups working under the umbrella of the Durham Centre for Crop Improvement Technologies (https://www.dur.ac.uk/dccit/). For example, we have collaborated with Prof. Patrick Hussey to generate fluorescent probes to study plant peroxisome dynamics and explore herbicides targeting plant cell wall biosynthesis; with Dr. Ehmke Pohl (Durham), Prof. Robert Edwards (Newcastle University) we are studying enzymes associated with herbicide detoxification and resistance with a specific goal to synthesise new herbicide synergists to understand and overcome multiple herbicide resistance in grass weeds. More recently, with Prof. Mark Knight (Durham) we have started a programme probing the role of calcium signaling in plants particularly in relation to root development under conditions of stress (drought, freezing etc).
Image showing co-localisation (yellow staining) of peroxisome probe PTS1-mCherry (red) and Durham synthesised BODIPYprobe (green) in Nicotiana benthamiana stomata cells. Scale bar 10 mm.
Our interests in parasite chemical biology focus on leishmaniasis and human African trypanosomiasis (both African Sleeping Sickness and Chagas disease). These are some of the Worlds most serious neglected diseases with over 350 million people considered to be at risk and result in excess of 3.3 million DALYs. We have a major ongoing collaboration with Dr Paul Denny (Durham) supported by both MRCT Ltd and GSK to develop new therapies for leishmaniasis. Towards this end we have identified enzymes associated with complex sphinglipid biosynthesis as potential new drug targets, developed assays and used these to identify compounds with activity and selectivity that we are currently optimising. In parallel, and in collaboration with Prof. Bartira Bergmann (Rio de Janeiro), we are developing probes to identify and validate new drug targets for this disease. Ultimately we hope to find compounds that have the potential to make a difference to some of the world’s poorest people.
 C.-T. Yang, Z.-Q. Zhang, H. Tajuddin, C.-C. Wu, J. Liang, J.-H. Liu, Y. Fu, M. Czyzewska, P. G. Steel, T. B. Marder, and L. Liu, ‘Alkylboronic Esters from Copper-Catalyzed Borylation of Primary and Secondary Alkyl Halides and Pseudo-Halides’, Angew.Chem. Int. Ed., 2012, 51, 528-532.
 H. Tajuddin , P. Harrisson , B. Bitterlich , J. C. Collings , N. Sim , A. S. Batsanov, M. S.Cheung , S. Kawamorita , A. C. Maxwell , L. Shukla , J. Morris , Z. Lin , T. B. Marder and P. G. Steel, ‘Iridium-catalyzed C–H borylation of quinolines and unsymmetrical 1,2- disubstituted benzenes: insights into steric and electronic effects on selectivity’, Chem. Sci., 2012, 3, 3505-3515; S. A. Sadler, H. Tajuddin, I. A. I. Mkhalid, A. S. Batsanov, M. S. Cheung, A. C. Maxwell, L. Shukla, B. Roberts, D. Blakemore, Z. Lin, T. B. Marder and P. G. Steel, ‘Iridium-Catalyzed C-H Borylation of Pyridines’Org. Biomol. Chem. 2014., 12, 7318 – 7327.
 P. Harrisson, J. Morris, P. G. Steel and T. B. Marder, ‘A One-Pot, Single-Solvent Process for Tandem, Catalyzed C–H Borylation–Suzuki–Miyaura Cross-Coupling Sequences’, Synlett., 2009, 147-150; H. Tajuddin, L. Shukla, A. Maxwell, T. B. Marder and P. G. Steel, ‘A “One-Pot” Tandem C-H Borylation/1,4-Conjugate Addition/Reduction Sequence’, Org. Lett., 2010, 12, 5700-5703.
 S. K. Bose, K. Fucke, L. Liu, P. G. Steel, T. B. Marder ‘Zinc-Catalyzed Borylation of Primary, Secondary and Tertiary Alkyl Halides with Alkoxy Diboron Reagents at Room Temperature’, Angew.Chem. Int. Ed., 2014, 53, 1799-1803
 H. Ottosson and P. G. Steel, ‘Silylenes, Silenes, and Disilenes: Novel silicon based reagents for organic synthesis?’ Chem. Eur. J., 2006, 12, 1576-1585.
 R. D. C. Pullin, J. D. Sellars, and P. G. Steel, ‘Total Synthesis of (±)-Epipicropodophyllin’ Org. Biomol. Chem., 2007, 5, 3201-3206. J. D. Sellars and P. G. Steel, ‘Application of Silacyclic Allylsilanes to the Synthesis of b-Hydroxy-d-Lactones: Synthesis of Prelactone B‘, Tetrahedron., 2009, 65, 5588-5595. M. Czyzewski, J. D. Sellars, T. Guliashvili, J. Tibbelin, Julius, L. Johnstone, J. Bower, M. Box, R. D. M. Davies, H. Ottosson, and P. G. Steel, ‘The first intramolecular silene Diels-Alder reactions’, Chem. Commun., 2014, 50, 2919-2921.
 M. Czyzewski, J. Bower, M. Box, H. Ottosson and P. G. Steel, ‘Silene Equivalents Through the Rhodium Catalysed Reactions of a-Hypersilyl Diazoesters.’ Chem. Sci., 2011, 2, 2367 -2372.
 M. Landrum, A. Smertenko, R. Edwards, P. J. Hussey and P. G. Steel, ‘BODIPY Probes to Study Peroxisome Function in Vivo’ Plant. J., 2010, 62, 529-538.
 I. Cummins, D. J. Wortley, F. Sabbadin, Z. He, C. R. Coxon, H. E. Straker, J. Sellars, K. M. Knight, L. Edwards, D. Hughes, S. S. Kaundun, S.-J. Hutchings, P. G. Steel and R. Edwards’ A key role for a glutathione transferase in multiple herbicide resistance in grass weeds’, Proc. Nat. Acad. Sci., 2013, 110, 5812-5817
 J. G. Mina, S. Y. Pan, N. K. Wansadhipathi, C. R. Bruce, H. Shams-Eldin, R. T. Schwarz, P. G. Steel, and P. W. Denny, ‘The Trypanosoma brucei sphingolipid synthase, an essential enzyme and drug target’ Mol. Biochem. Parasitol., 2009, 168, 16-23; J. G. Mina, J. A. Mosely, H. Shams-Eldin, R. T. Schwarz, P. G. Steel and P. W. Denny, ‘A plate-based assay system for analyses and screening of the Leishmania major inositol phosphorylceramide synthase.’ Int. J. Biochem. Cell. Biol., 2010, 42, 1553-1561; J. G. Mina, J. A. Mosely, H. Z. Ali, P. W. Denny and P. G. Steel, ‘Exploring Leishmania major inositol phosphorylceramide synthase (LmjIPCS): Insights into the ceramide binding domain.’ Org. Biomol. Chem. 2011, 9, 1823; J.L. Norcliffe, E. Alvarez-Ruiz, J.J. Martin-Plaza, P.G. Steel and P.W. Denny, The utility of yeast as a tool for cell-based, target-directed high throughput screening, Parasitology, 2013, 141, 8-16.