The Larock group at Iowa State University will prepare for high throughput screening a large number of libraries of heterocycles and carbocycles expected to exhibit a wide range of biological activity. Three very general synthetic methods primarily developed in the Larock group will be employed. (1) The Pd-catalyzed annulation of alkynes, dienes, alkenes and arynes will be employed to prepare specially diverse libraries of indoles, benzofurans, benzopyrans, coumarins, isocoumarins, phthalides, pyrones, 2-quinolones, pyridines, isoquinolin-1-ones, isoindolin-1-ones, isoquinolines, carbolines, isoindolo[2,1-a]indoles, carbazoles, dibenzofurans and various other heterocycles, plus indenones, indenes, fluoren-9-ones and 9-alkylidene-9Hfluorenes. (2) The cyclization of readily available, functionally-substituted alkynes by halogen, sulfur, selenium and organopalladium electrophiles will be utilized to prepare libraries of medicinally interesting indoles, benzofurans, coumestans, chromones, benzothiophenes, benzoselenophenes, phthalides, isocoumarins, isochromenes, isoquinolines, quinolines, furans, isoxazoles and various spirotrienones. (3) Aryne annulations will be used to prepare xanthones, thioxanthones and acridones. Halogen-containing heterocycles and carbocycles will be further elaborated to more diverse libraries by well known, Pd-catalyzed processes. This methodology is very efficient, tolerates virtually all important organic functional groups, proceeds under mild reaction conditions, affords high yields of very pure compounds, and uses readily available starting materials, reagents and catalysts. Libraries consisting of (20-100 novel, small, densely functionalized, specially diverse compounds will be prepared by this very versatile solution and solid phase chemistry already worked out in the Larock group. Racemic mixtures will be separated by the Armstrong group in Texas and molecular modeling will be carried out by the Lushington group at Kansas University. The resulting libraries will be purified to generally >95% purity using standard laboratory techniques and, if necessary, the high throughput purification techniques available to the PI through the Kansas University Center of Excellence in Chemical Methodologies and Library Development. This methodology will be widely published and the resulting libraries donated to the NIH Molecular Libraries Small-Molecule Repository and the Molecular Libraries Screening Center Network. ? ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Biotechnology Resource Grants (P41)
Project #
5P41GM079593-02
Application #
7286748
Study Section
Special Emphasis Panel (ZGM1-PPBC-3 (PL))
Program Officer
Schwab, John M
Project Start
2006-09-15
Project End
2009-08-31
Budget Start
2007-09-01
Budget End
2008-08-31
Support Year
2
Fiscal Year
2007
Total Cost
$333,075
Indirect Cost
Name
Iowa State University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
005309844
City
Ames
State
IA
Country
United States
Zip Code
50011
Mehta, Saurabh; Waldo, Jesse P; Neuenswander, Benjamin et al. (2013) Solution-phase parallel synthesis of a multisubstituted cyclic imidate library. ACS Comb Sci 15:247-54
Dubrovskiy, Anton V; Jain, Prashi; Shi, Feng et al. (2013) Solution-phase synthesis of a diverse library of benzisoxazoles utilizing the [3 + 2] cycloaddition of in situ-generated nitrile oxides and arynes. ACS Comb Sci 15:193-201
Dubrovskiy, Anton V; Larock, Richard C (2013) Intermolecular C-O Addition of Carboxylic Acids to Arynes: Synthesis of o-Hydroxyaryl Ketones, Xanthones, 4-Chromanones, and Flavones. Tetrahedron 69:2789-2798
Cho, Chul-Hee; Shi, Feng; Jung, Dai-Il et al. (2012) Solution-phase synthesis of a highly substituted furan library. ACS Comb Sci 14:403-14
Lu, Chun; Dubrovskiy, Anton V; Larock, Richard C (2012) Synthesis of benzisoxazolines by the coupling of arynes with nitrones. J Org Chem 77:2279-84
Mehta, Saurabh; Yao, Tuanli; Larock, Richard C (2012) Regio- and stereoselective synthesis of cyclic imidates via electrophilic cyclization of 2-(1-alkynyl)benzamides. A correction. J Org Chem 77:10938-44
Fang, Yuesi; Wu, Chunrui; Larock, Richard C et al. (2011) Synthesis of 2H-indazoles by the [3 + 2] dipolar cycloaddition of sydnones with arynes. J Org Chem 76:8840-51
Cho, Chul-Hee; Jung, Dai-Il; Neuenswander, Benjamin et al. (2011) Parallel synthesis of a desketoraloxifene analogue library via iodocyclization/palladium-catalyzed coupling. ACS Comb Sci 13:501-10
Markina, Nataliya A; Mancuso, Raffaella; Neuenswander, Benjamin et al. (2011) Solution-phase parallel synthesis of a diverse library of 1,2-dihydroisoquinolines. ACS Comb Sci 13:265-71
Cho, Chul-Hee; Larock, Richard C (2011) Highly substituted lactone/ester-containing furan library by the palladium-catalyzed carbonylation of hydroxyl-substituted 3-iodofurans. ACS Comb Sci 13:272-9

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