- Ir-Catalyzed Ligand-Free Directed C-H Borylation of Arenes and Pharmaceuticals: Detailed Mechanistic Understanding
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An efficient method for Ir-catalyzed ligand free ortho borylation of arenes (such as, 2-phenoxypyridines, 2-anilinopyridines, benzylamines, benzylpiperazines, benzylmorpholines, benzylpyrrolidine, benzylpiperidines, benzylazepanes, α-amino acid derivatives, aminophenylethane derivatives, and other important scaffolds) and pharmaceuticals has been developed. The reaction underwent via an interesting mechanistic pathway, as revealed by the detailed mechanistic investigations by using kinetic isotope studies and DFT calculations. The catalytic cycle is found to involve the intermediacy of an Ir-boryl complex where the substrate C-H activation is the turnover determining step, intriguingly without any appreciable primary KIE. The method displays a broad range of substrate scope and functional group tolerance. Numerous late-stage borylation of various important molecules and drugs were achieved using this developed strategy. The borylated compounds were further converted into more valuable functionalities. Moreover, utilizing the benefit of the B-N intramolecular interaction of the mono borylated compounds, an operationally simple method has been developed for the selective diborylation of 2-phenoxypyridines and numerous functionalized arenes. Furthermore, the synthetic utility has been showcased with the removal of the pyridyl directing group from the borylated product to achieve ortho borylated phenol along with the ipso-borylation for the preparation of 1,2-diborylated benzene.
- Mahamudul Hassan, Mirja Md,Mondal, Biplab,Singh, Sukriti,Haldar, Chabush,Chaturvedi, Jagriti,Bisht, Ranjana,Sunoj, Raghavan B.,Chattopadhyay, Buddhadeb
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p. 4360 - 4375
(2022/03/16)
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- Ring size changes in the development of class I HDAC inhibitors
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Five pathways involving different ring structures led to generation of fourteen thienylbenzamides (7–20) which display the structure-activity relationships of class I HDAC inhibitors. All the synthesised compounds inhibit HDAC1 and HDAC2 selectively over other isoforms and many inhibit DLD1 and HCT116 cells more effectively than a parent compound. Compounds 8 and 16 inhibit HCT116 cells by activation of the apoptosis pathway.
- Cho, Er-Chieh,Liu, Chi-Yuan,Tang, Di-Wei,Lee, Hsueh-Yun
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p. 1387 - 1401
(2021/07/06)
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- New direct inhibitors of InhA with antimycobacterial activity based on a tetrahydropyran scaffold
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Tetrahydropyran derivative 1 was discovered in a high-throughput screening campaign to find new inhibitors of mycobacterial InhA. Following initial in-vitro profiling, a structure-activity relationship study was initiated and a focused library of analogs was synthesized and evaluated. This yielded compound 42 with improved antimycobacterial activity and low cytotoxicity. Additionally, the crystal structure of InhA in complex with inhibitor 1 was resolved, to reveal the binding mode and provide hints for further optimization.
- Pajk, Stane,?ivec, Matej,?ink, Roman,Sosi?, Izidor,Neu, Margarete,Chung, Chun-Wa,Martínez-Hoyos, María,Pérez-Herrán, Esther,álvarez-Gómez, Daniel,álvarez-Ruíz, Emilio,Mendoza-Losana, Alfonso,Castro-Pichel, Julia,Barros, David,Ballell-Pages, Lluís,Young, Robert J.,Convery, Maire A.,Encinas, Lourdes,Gobec, Stanislav
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supporting information
p. 252 - 257
(2016/05/02)
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- Thrombopoietin Receptor Agonists
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A compound of the formula (I) useful as promoters of thrombopoiesis and megakaryocytopoiesis, wherein A, B, D, E, W, X, Y, Z, R1 and R2 are defined as above.
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Page/Page column 24
(2010/11/30)
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- Pyrimidine benzamide-based thrombopoietin receptor agonists
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A series of pyrimidine benzamide-based thrombopoietin receptor agonists is described. The lead molecule contains a 2-amino-5-unsubstituted thiazole, a group that has been associated with idiosyncratic toxicity. The potential for metabolic oxidation at C-5 of the thiazole, the likely source of toxic metabolites, was removed by substitution at C-5 or by replacing the thiazole with a thiadiazole. Potency in the series was improved by modifying the substituents on the pyrimidine and/or on the thiazole or thiadiazole pendant aryl ring. In vivo examination revealed that compounds from the series are not highly bioavailable. This is attributed to low solubility and poor permeability.
- Reiter, Lawrence A.,Subramanyam, Chakrapani,Mangual, Emilio J.,Jones, Christopher S.,Smeets, Marc I.,Brissette, William H.,McCurdy, Sandra P.,Lira, Paul D.,Linde, Robert G.,Li, Qifang,Zhang, Fangning,Antipas, Amy S.,Blumberg, Laura C.,Doty, Jonathan L.,Driscoll, James P.,Munchhof, Michael J.,Ripp, Sharon L.,Shavnya, Andrei,Shepard, Richard M.,Sperger, Diana,Thomasco, Lisa M.,Trevena, Kristen A.,Wolf-Gouveia, Lilli A.,Zhang, Liling
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p. 5447 - 5454
(2008/03/11)
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