2973-80-0Relevant articles and documents
Synthesis of Complex Stereoheptads en Route to Daphnane Diterpene Orthoesters
Nguyen, Long V.,Beeler, Aaron B.
, p. 5177 - 5180 (2018)
Tricyclic cores of the daphnane diterpene orthoesters (DDOs) are synthesized in 10 steps from readily available materials. Key to their assembly is the development of a stereocontrolled p-quinol functionalization sequence which enables rapid access to DDO C-ring stereopolyads from simple precursors. Problems encountered in stereo- and regioselectivity are highlighted and solved by exact changes in choreography, although it is shown that the undesired stereochemical outcomes also proceed with high selectivity.
2-Bromo-5-hydroxybenzaldehyde
Matos Beja,Paixao,Ramos Silva,Alte Da Veiga,Rocha Gonsalves,Serra
, p. 354 - 355 (2000)
The molecules of the title compound, C7H5BrO2, form zigzag chains running along the b axis and are stacked in layers perpendicular to the a axis. Intermolecular bonding occurs through hydrogen bonds linking the hydroxyl and carbonyl groups, with an O...O distance of 2.804 (4) A. The Br atom deviates significantly from the plane of the ring and the aldehyde group is twisted by 7.1 (5)° around the Csp2-Carylbond. The geometry of the molecule in the crystal is compared to that given by ab initio quantum mechanical calculations for the isolated molecule, using a molecular orbital Hartree-Fock method and density functional theory.
Synthesis of new Zn (II) complexes for photo decomposition of organic dye pollutants, industrial wastewater and photo-oxidation of methyl arenes under visible-light
Ahemed, Jakeer,Bhongiri, Yadagiri,Chetti, Prabhakar,Gade, Ramesh,Kore, Ranjith,Pasha, Jakeer,Pola, Someshwar,Rao D, Venkateshwar
, (2021/07/28)
Synthesis of new Schiff's base Zn-complexes for photo-oxidation of methyl arenes and xylenes are reported under visible light irradiation conditions. All the synthesized new ligands and Zn-complexes are thoroughly characterized with various spectral analyses and confirmed as 1:1 ratio of Zn and ligand with distorted octahedral structure. The bandgap energies of the ligands are higher than its Zn-complexes. These synthesized new Zn(II) complexes are used for the photo-fragmentation of organic dye pollutants, photodegradation of food industrial wastewater and oxidation of methyl arenes which are converted into its respective aldehydes with moderate yields under visible light irradiation. The photooxidation reaction dependency on the intensity of the visible light was also studied. With the increase in the dosage of photocatalyst, the methyl groups are oxidized to get aldehydes and mono acid products, which are also identified from LC-MS data. Finally, [Zn(PPMHT)Cl] is with better efficiency than [Zn(PTHMT)Cl] and [Zn(MIMHPT)Cl] for oxidation of methyl arenes is reported under visible-light-driven conditions.
MACROCYCLIC BROAD SPECTRUM ANTIBIOTICS
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Paragraph 00976, (2017/08/01)
Provided herein are antibacterial compounds, wherein the compounds in some embodiments have broad spectrum bioactivity. In various embodiments, the compounds act by inhibition of bacterial type 1 signal peptidase (SpsB), an essential protein in bacteria. Pharmaceutical compositions and methods for treatment using the compounds described herein are also provided.
Optimization of Manganese Coupling Reaction for Kilogram-Scale Preparation of Two Aryl-1,3-dione Building Blocks
Smejkal, Tomas,Gopalsamuthiram, Vijayagopal,Ghorai, Sujit K.,Jawalekar, Anup M.,Pagar, Dinesh,Sawant, Krishna,Subramanian, Srinivas,Dallimore, Jonathan,Willetts, Nigel,Scutt, James N.,Whalley, Louisa,Hotson, Matthew,Hogan, Anne-Marie,Hodges, George
, p. 1625 - 1632 (2017/10/25)
Aryl-1,3-diones represent a promising new class of herbicidal acetyl-CoA carboxylase (ACCase) inhibitors. The original synthesis of this structural motif employed in the research phase involved a selenium oxide mediated oxidation, the use of diazoacetate and aryl lead reagents, and a low temperature oxidation of an aryl lithium intermediate, so it was not well suited to large scale synthesis. For kilogram scale synthesis of the two aryl-1,3-dione building blocks (3 and 4), we developed an alternative route which employs a manganese or manganese-copper catalyzed alkyl Grignard coupling and a semi-pinacol rearrangement of an epoxide as the key steps. The optimized conditions could be of general interest as scalable methods for the synthesis of 2-alkyl substituted benzaldehydes and of 2-aryl-1,3-diones.
GPBP INHIBITORS AND USES AND SCALEABLE SYNTHESIS THEREOF
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Page/Page column 44; 55; 100, (2017/12/27)
The present invention provides compounds and compositions thereof that inhibit Goodpasture antigen binding protein. Also disclosed is use of the compounds for the treatment various diseases and disorders, including invasive tumors, for the inhibition of mesenchymal phenotype after epithelial-to-mesenchymal transition (EMT), and for detecting EMT in a tissue. A method of preparing the compounds of the invention and related compounds is also provided.
Exploring the Strength of the H-Bond in Synthetic Models for Heme Proteins: The Importance of the N?H Acidity of the Distal Base
Alberti, Mariza N.,Polyhach, Yevhen,Tzirakis, Manolis D.,T?dtli, Laura,Jeschke, Gunnar,Diederich, Fran?ois
supporting information, p. 10194 - 10202 (2016/07/19)
The distal hydrogen bond (H-bond) in dioxygen-binding proteins is crucial for the discrimination of O2with respect to CO or NO. We report the preparation and characterization of a series of ZnIIporphyrins, with one of three meso-phenyl rings bearing both an alkyl-tethered proximal imidazole ligand and a heterocyclic distal H-bond donor connected by a rigid acetylene spacer. Previously, we had validated the corresponding CoIIcomplexes as synthetic model systems for dioxygen-binding heme proteins and demonstrated the structural requirements for proper distal H-bonding to CoII-bound dioxygen. Here, we systematically vary the H-bond donor ability of the distal heterocycles, as predicted based on pKavalues. The H-bond in the dioxygen adducts of the CoIIporphyrins was directly measured by Q-band Davies-ENDOR spectroscopy. It was shown that the strength of the hyperfine coupling between the dioxygen radical and the distal H-atom increases with enhanced acidity of the H-bond donor.
Rapid formation of a stable boron-nitrogen heterocycle in dilute, neutral aqueous solution for bioorthogonal coupling reactions
Dilek, Ozlem,Lei, Zhen,Mukherjee, Kamalika,Bane, Susan
supporting information, p. 16992 - 16995 (2015/12/01)
Combining 2-formylphenylboronic acid with 4-hydrazinylbenzoic acid in neutral aqueous solution at low, equimolar concentrations of the reagents results in a single, stable product, a 1,2-dihydro-1-hydroxy-2,3,1-benzodiazaborine, in a matter of minutes with no side products. Application of this reaction to protein conjugation demonstrates that the reaction is orthogonal to protein functional groups, and the resulting conjugate withstands SDS-PAGE analysis. This reaction should be particularly useful for couplings that must be performed with low concentrations of reagents under physiologically compatible conditions.
Assessment of mycobacterium tuberculosis pantothenate kinase vulnerability through target knockdown and mechanistically diverse inhibitors
Reddy, B. K. Kishore,Landge, Sudhir,Ravishankar, Sudha,Patil, Vikas,Shinde, Vikas,Tantry, Subramanyam,Kale, Manoj,Raichurkar, Anandkumar,Menasinakai, Sreenivasaiah,Mudugal, Naina Vinay,Ambady, Anisha,Ghosh, Anirban,Tunduguru, Ragadeepthi,Kaur, Parvinder,Singh, Ragini,Kumar, Naveen,Bharath, Sowmya,Sundaram, Aishwarya,Bhat, Jyothi,Sambandamurthy, Vasan K.,Bj?rkelid, Christofer,Jones, T. Alwyn,Das, Kaveri,Bandodkar, Balachandra,Malolanarasimhan, Krishnan,Mukherjee, Kakoli,Ramachandran, Vasanthi
, p. 3312 - 3326 (2014/06/09)
Pantothenate kinase (PanK) catalyzes the phosphorylation of pantothenate, the first committed and rate-limiting step toward coenzyme A (CoA) biosynthesis. In our earlier reports, we had established that the type I isoform encoded by the coaA gene is an essential pantothenate kinase in Mycobacterium tuberculosis, and this vital information was then exploited to screen large libraries for identification of mechanistically different classes of PanK inhibitors. The present report summarizes the synthesis and expansion efforts to understand the structure-Activity relationships leading to the optimization of enzyme inhibition along with antimycobacterial activity. Additionally, we report the progression of two distinct classes of inhibitors, the triazoles, which are ATP competitors, and the biaryl acetic acids, with a mixed mode of inhibition. Cocrystallization studies provided evidence of these inhibitors binding to the enzyme. This was further substantiated with the biaryl acids having MIC against the wild-type M. tuberculosis strain and the subsequent establishment of a target link with an upshift in MIC in a strain overexpressing PanK. On the other hand, the ATP competitors had cellular activity only in a M. tuberculosis knockdown strain with reduced PanK expression levels. Additionally, in vitro and in vivo survival kinetic studies performed with a M. tuberculosis PanK (MtPanK) knockdown strain indicated that the target levels have to be significantly reduced to bring in growth inhibition. The dual approaches employed here thus established the poor vulnerability of PanK in M. tuberculosis.
IMPROVED PROCESS FOR THE PREPARATION OF TREPROSTINIL AND DERIVATIVES THEREOF
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Page/Page column 18, (2014/01/07)
An improved method for the preparation of treprostinil and its derivatives is described. In contrast to prior art, this method utilizes an easily scalable enzymatic resolution of a key intermediate for making these compounds. Another significant improvement of the described method over prior methods is the regioselective Claisen rearrangement of a 5-allyloxy-benzaldehyde precursor, which is facilitated by a bromo substituent in 2-position.
