64230-41-7Relevant academic research and scientific papers
Inter- and intramolecular hydrogen bonds - Structures of 1-methylpyrrole-2-carboxamide and 1-hydroxypyrrole-2-carboxamide
Grabowski, S?awomir J.,Palusiak, Marcin,Dubis, Alina T.,Pfitzner, Arno,Zabel, Manfred
, p. 173 - 180 (2007)
The structures of 1-methylpyrrole-2-carboxamide (MPCA) and 1-hydroxypyrrole-2-carboxamide (HPCA) are analyzed, for both structures B3LYP/6-311++G(d,p) calculations were performed on s-cis and s-trans conformations and on monomeric and dimeric forms of these conformers. N-H?O hydrogen bonds exist for dimers. The X-ray crystal structure of MPCA is also analyzed; centrosymmetric dimers of syn conformers connected through N-H?O hydrogen bonds exist in crystal structure as well as C-H?O intramolecular interactions possessing some of characteristics typical for hydrogen bond.
Identification and Optimization of Novel Small-Molecule Cas9 Inhibitors by Cell-Based High-Throughput Screening
Lee, Sang-Woo,Tran, Kim Tai,Vazquez-Uribe, Ruben,Gotfredsen, Charlotte Held,Clausen, Mads Hartvig,Mendez, Blanca Lopez,Montoya, Guillermo,Bach, Anders,Sommer, Morten Otto Alexander
, p. 3266 - 3305 (2022/02/23)
CRISPR/Cas9 has revolutionized several areas of life science; however, methods to control the Cas9 activity are needed for both scientific and therapeutic applications. Anti-CRISPR proteins are known to inhibit the CRISPR/Cas adaptive immunity; however, in vivo delivery of such proteins is problematic. Instead, small-molecule Cas9 inhibitors could serve as useful tools due to their permeable, proteolytically stable, and non-immunogenic nature. Here, we identified a small-molecule ligand with anti-CRISPR/Cas9 activity through a high-throughput screening utilizing an Escherichia coli selection system. Extensive structure-activity relationship studies, which involved a deconstruction-reconstruction strategy, resulted in a range of analogues with significant improvements in the inhibitory activity. Based on NMR and electrophoretic mobility shift assays, we propose that the inhibitory action of these compounds likely results from direct binding to apo-Cas9, preventing Cas9:gRNA complex formation. These molecules may find use as Cas9 modulators in various applications.
Development and Utilization of a Palladium-Catalyzed Dehydration of Primary Amides to Form Nitriles
Al-Huniti, Mohammed H.,Rivera-Chávez, José,Colón, Katsuya L.,Stanley, Jarrod L.,Burdette, Joanna E.,Pearce, Cedric J.,Oberlies, Nicholas H.,Croatt, Mitchell P.
supporting information, p. 6046 - 6050 (2018/09/27)
A palladium(II) catalyst, in the presence of Selectfluor, enables the efficient and chemoselective transformation of primary amides into nitriles. The amides can be attached to aromatic rings, heteroaromatic rings, or aliphatic side chains, and the reactions tolerate steric bulk and electronic modification. Dehydration of a peptaibol containing three glutamine groups afforded structure-activity relationships for each glutamine residue. Thus, this dehydration can act similarly to an alanine scan for glutamines via synthetic mutation.
Synthesis of pyrrole-imidazole polyamide oligomers based on a copper-catalyzed cross-coupling strategy
Shiga, Naoki,Takayanagi, Shihori,Muramoto, Risa,Murakami, Tasuku,Qin, Rui,Suzuki, Yuta,Shinohara, Ken-ichi,Kaneda, Atsushi,Nemoto, Tetsuhiro
supporting information, p. 2197 - 2200 (2017/04/27)
Pyrrole-imidazole (Py-Im) polyamides are useful tools for chemical biology and medicinal chemistry studies due to their unique binding properties to the minor groove of DNA. We developed a novel method of synthesizing Py-Im polyamide oligomers based on a Cu-catalyzed cross-coupling strategy. All four patterns of dimer fragments could be synthesized using a Cu-catalyzed Ullmann-type cross-coupling with easily prepared monomer units. Moreover, we demonstrated that pyrrole dimer, trimer, and tetramer building blocks for Py-Im polyamide synthesis were accessible by combining site selective iodination of the pyrrole/pyrrole coupling adduct.
Isocyanatophosphoryl Dichloride as Reagent for Introduction of Carbamoyl Group into Molecules of π-Excessive Heterocycles and Enamines
Smaliy, Radomir V.,Chaikovskaya, Aleksandra A.,Pinchuk, Aleksandr M.,Tolmachev, Andrei A.
, p. 2525 - 2529 (2007/10/03)
A study on the stepwise hydrolysis of hetarene- and cycloalkenecarboxamidophosphoryl dichlorides afforded the synthesis of hitherto unknown hetarene- and cycloalkene-carboxamidophosphoric acids as well as allowing the introduction of unsubstituted carbamoyl group in the molecules of pyrroles, indoles, indolizines, and some enamines.
Direct conversion of aldehydes to amides, tetrazoles, and triazines in aqueous media by one-pot tandem reactions
Shie, Jiun-Jie,Fang, Jim-Min
, p. 1158 - 1160 (2007/10/03)
A variety of aldehydes reacted with iodine in ammonia water at room temperature to give the nitrile intermediates, which were trapped by addition of hydrogen peroxide, sodium azide, or dicyandiamide to produce their corresponding amides, tetrazoles, and 1,3,5-triazines in modest to high yields. The one-pot tandem reactions were conducted in water media, and the products were obtained simply by extraction or filtration.
Piperazinylalkyl Heterocycles as Potential Antipsychotic Agents
Scott, Malcolm K.,Baxter, Ellen W.,Bennett, Debra J.,Boyd, Robert E.,Blum, Paul S.,et al.
, p. 4198 - 4210 (2007/10/03)
We recently reported on a series of pyrrole Mannich bases orally active in inhibiting the conditioned avoidance response (CAR) in rats.These compounds exhibit affinity for both D2 and 5-HT1A receptors, and some are noncataleptogenic.Such a profile suggest that they may be potential antipsychotic agents which lack the propensity for causing extrapyramidal side effects and tardive dyskinesias in humans.One of these compounds, 1--1-piperazinyl>methyl>-1H-pyrrol-2-yl>methyl>-2-piperidinone (RWJ 25730, 1), was chosen for further development but found to be unstable in dilute acid.In order to improve stability, we replaced the pyrrole methylene linkage to the piperazine ring with ethylene, employed ethylene and dicarbonyl as linkers between the lactam and the pyrrole ring, placed electron-withdrawing groups on the pyrrole ring, and substituted acyclic amide for lactam.In addition, we replaced the pyrrole segment with other heterocycles including thiophene, furan, isoxazole, isoxazoline, and pyridine.Generally, replacemcent of the N-methylpyrrole segment with thiophene, furan, isoxazoline, or pyridine afforded compounds equipotent with 1 in CAR, which were more stable in dilute acid.In the case of side chain or lactam modifications, CAR activity was significantly decreased or abolished, with the exception of 6.For the most part, the modifications to 1 resulted in the decrease or loss of D2 receptor binding.However, within this series, 5-HT1A receptor binding was greatly increased, with thiophene 40 exhibiting an IC50 of 0.07 nM.The CAR activities of pyrroles 6 and 12, thiophene 40, furans 44-47, isoxazolines 49 and 50, pyridine 54 coupled with their weak or nonexistent D2 binding and strong 5-HT1A binding suggest that they may be acting via a nondopaminergic mechanism or that dopaminergic active metabolites are responsible.Pyrrole 6 and furans 44 and 47 show promise as antipsychotic agents based on their CAR activity, receptor-binding profile, and solution stability.
Preparation of Pyrroles from Pyroglutamic Acid Derivatives
Rigo, Benoit,Fasseur, Dominique,Leduc, Catherine,Couturier, Daniel
, p. 1769 - 1776 (2007/10/02)
Heating of the vinylogs of N-acyl N,O-acetals 3 in acetic acid, preferably in the presence of acetic anhydride and pyridine, yields pyrroles 4 in good yields.
