amides-buliding-blocks Archives - Page 336 of 1299

Das, Pradipta’s team published research in Journal of the American Chemical Society in 2021-04-21 | CAS: 343338-28-3

Journal of the American Chemical Society published new progress about Chiral auxiliary. 343338-28-3 belongs to class amides-buliding-blocks, name is (S)-2-Methylpropane-2-sulfinamide, and the molecular formula is C4H11NOS, Related Products of amides-buliding-blocks.

Das, Pradipta published the artcileDramatic Effect of γ-Heteroatom Dienolate Substituents on Counterion Assisted Asymmetric Anionic Amino-Cope Reaction Cascades, Related Products of amides-buliding-blocks, the main research area is counterion assisted anionic cascade Mannich reaction Cope rearrangement cyclization.

We report a dramatic effect on product outcomes of the lithium ion enabled amino-Cope-like anionic asym. cascade when different γ-dienolate heteroatom substituents are employed. For dienolates with azide, thiomethyl, and trifluoromethylthiol substituents, a Mannich/amino-Cope/cyclization cascade ensues to form chiral cyclohexenone products with two new stereocenters in an anti-relationship. For fluoride-substituted nucleophiles, a Mannich/amino-Cope cascade proceeds to afford chiral acyclic products with two new stereocenters in a syn-relationship. Bromide- and chloride-substituted nucleophiles appear to proceed via the same pathway as the fluoride albeit with the added twist of a 3-exo-trig cyclization to yield chiral cyclopropane products with three stereocenters. When this same class of nucleophiles is substituted with a γ-nitro group, the Mannich-initiated cascade is now diverted to a β-lactam product instead of the amino-Cope pathway. These anionic asym. cascades are solvent- and counterion-dependent, with a lithium counterion being essential in combination with ethereal solvents such as MTBE and CPME. By altering the geometry of the imine double bond from E to Z, the configurations at the R1 and X stereocenters are flipped. Mechanistic, computational, substituent, and counterion studies suggest that these cascades proceed via a common Mannich-product intermediate, which then proceeds via either a chair (X = N3, SMe, or SCF3) or boat-like (X = F, Cl, or Br) transition state to afford amino-Cope-like products or β-lactam in the case of X = NO2.

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Ma, Xin’s team published research in Journal of Organic Chemistry in 2021-02-19 | CAS: 123-39-7

Journal of Organic Chemistry published new progress about Crystal structure. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Quality Control of 123-39-7.

Ma, Xin published the artcileProtonated Ground-State Singlet meta-Pyridynes React from an Excited Triplet State, Quality Control of 123-39-7, the main research area is protonated meta pyridyne singlet ground triplet excited state reactivity.

The gaseous 2,6-didehydropyridinium cation and its derivatives transfer a proton to reagents for which the reaction for their singlet ground states is too endothermic to be observed These reactions occur from the lowest-energy excited triplet states, which has not been observed (or reported) for other meta-benzyne analogs. Quantum chem. calculations indicate that the (excited) triplet states are stronger Bronsted acids than their (ground) singlet states, likely due to unfavorable three-center, four-electron interactions in the singlet-state conjugate bases. The cations have substantially smaller (calculated) singlet-triplet (S-T) splittings (ranging from ca. -11 to -17 kcal mol-1) than other related meta-benzyne analogs (e.g., -23.4 kcal mol-1 for the 3,5-isomer). This is rationalized by the destabilization of the singlet states (relative to the triplet states) by reduced (spatial) overlap of the nonbonding MOs due to the presence of the nitrogen atom between the radical sites (making the ring more rigid). Both the singlet and triplet states are believed to be generated upon formation of these biradicals via energetic collisions due to their small S-T splittings. It appears that once the triplet states are formed, the rate of proton transfer is faster than the rate of intersystem crossing unless the biradicals contain heavy atoms.

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Zhang, Stephanie J.’s team published research in Journal of the American Chemical Society in 2020-09-02 | CAS: 123-39-7

Journal of the American Chemical Society published new progress about Life, origin. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, SDS of cas: 123-39-7.

Zhang, Stephanie J. published the artcilePotentially Prebiotic Activation Chemistry Compatible with Nonenzymatic RNA Copying, SDS of cas: 123-39-7, the main research area is nonenzymic RNA replication life origin primer extension.

The nonenzymic replication of RNA may have enabled the propagation of genetic information during the origin of life. RNA copying can be initiated in the laboratory with chem. activated nucleotides, but continued copying requires a source of chem. energy for in situ nucleotide activation. Recent work has illuminated a potentially prebiotic cyanosulfidic chem. that activates nucleotides, but its application to nonenzymic RNA copying had not been demonstrated. Here, we report a novel pathway that activates RNA nucleotides in a manner compatible with template-directed nonenzymic copying. We show that this pathway, which we refer to as bridge-forming activation, selectively yields the reactive imidazolium-bridged dinucleotide intermediate required for copying. Our results will enable more realistic simulations of RNA propagation based on continuous in situ nucleotide activation.

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Xu, Ze-Ming’s team published research in Organic Letters in 2019-01-04 | CAS: 7465-88-5

Organic Letters published new progress about Isotope effect. 7465-88-5 belongs to class amides-buliding-blocks, name is 4-Methoxy-N-phenylbenzamide, and the molecular formula is C14H13NO2, Safety of 4-Methoxy-N-phenylbenzamide.

Xu, Ze-Ming published the artcileExogenous Photosensitizer-, Metal-, and Base-Free Visible-Light-Promoted C-H Thiolation via Reverse Hydrogen Atom Transfer, Safety of 4-Methoxy-N-phenylbenzamide, the main research area is benzothiazole preparation; photochem oxidative cyclization arylthioamide TEMPO catalyst; oxidative photochem intramol thiolation arylthioamide TEMPO catalyst; mechanism kinetics kinetic isotope effect photochem oxidative cyclization arylthioamide; reduction oxidation potential arylthioamide TEMPO.

N-Arylthioamides such as N-phenylthiobenzamide underwent photochem. visible-light oxidative cyclization reactions in the presence of TEMPO to yield benzothiazoles such as 2-phenylbenzothiazole without added photosensitizer, metal catalyst, or base. The mechanism of the reaction was studied by evaluation of the oxidation and reduction potentials of TEMPO and of selected reactants, determination of the kinetics of and kinetic isotope effects on the reaction, and mass spectrometric identification of reaction intermediates. The reaction likely occurs by absorption of visible light by thioamides to generate their excited states which undergo reverse hydrogen-atom transfer (RHAT) with 2,2,6,6-tetramethylpiperidine N-oxyl to form sulfur radicals; cyclization of the sulfur radicals onto the aryl ring followed by rearomatization via RHAT yields the benzothiazole products.

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Cengiz, Gokhan et al. published their research in Universal Journal of Pharmaceutical Research in 2021 |CAS: 144-80-9

The Article related to antibiotics pharmacopoeial potency microbiol chem method, Placeholder for records without volume info and other aspects.COA of Formula: C8H10N2O3S

Cengiz, Gokhan; Algin Yapar, Evren; Kara, Bilge Ahsen; Sindhu, Rakesh K. published an article in 2021, the title of the article was Comparison and evaluation of pharmacopoeial methods for the assessment of potency of antibiotics.COA of Formula: C8H10N2O3S And the article contains the following content:

The detection and assessment of potency of antibiotics are crucial for the pharmaceutics. The valid methods for microbiol. assays in pharmacopoeias are mainly based on statistical comparison of the data obtained by measuring the cidal activity resulting from the treatment of the antibiotic active ingredient in the composition of the pharmaceutics with the target microorganism. However, it was seen that there is no validated microbiol. method for some active ingredients. Due to microbiol. assays are indispensable methods for determining the potency of some active ingredient groups, the calculation of the potency is performed logarithmically. In either turbidimetric or chromatog. methods, the statistical evaluation of the sample is compared with the standard reference material. Anal. data obtained by chromatog. and chem. methods are linear peak areas and spectrophotometer readings. In microbiol. methods, the data obtained from the analyzes performed to determine the potency of antibiotics are the inhibition zone diameters or turbidimetric turbidity data. In this study, above-mentioned microbiol. assays are compared in the context of the main pharmacopoeias EP, USP, CP, IP and BP, and evaluated in terms of the chromatog. method and classical microbiol. method. It has been observed that chromatog. and chem. methods are not available to determine the potency of some pharmaceutical products containing antibiotics. The examinations made reveal the difficulty of analyzing some active ingredient groups according to chem. and chromatog. methods. For this reason, the importance of method validation studies is increasing in order to analyze active substances that do not have alternative anal. methods with microbiol. and chem. methods. In this study, all validated microbiol. methods were investigated, and it was aimed to determine alternative methods to chromatog. and chem. methods. It was concluded that the realization of new microbiol. methods to be validated by evaluating the methods in all differences would facilitate the study. The experimental process involved the reaction of N-((4-Aminophenyl)sulfonyl)acetamide(cas: 144-80-9).COA of Formula: C8H10N2O3S

The Article related to antibiotics pharmacopoeial potency microbiol chem method, Placeholder for records without volume info and other aspects.COA of Formula: C8H10N2O3S

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Wasserman, Emily J. et al. published their research in Cancer Epidemiology, Biomarkers & Prevention in 2018 |CAS: 27115-50-0

The Article related to premium discount brand cigarette tobacco smoke biomarker, Placeholder for records without volume info and other aspects.Application In Synthesis of 2-(4-Methylbenzamido)acetic acid

On May 31, 2018, Wasserman, Emily J.; Reilly, Samantha M.; Goel, Reema; Foulds, Jonathan; Richie, John P. Jr.; Muscat, Joshua E. published an article.Application In Synthesis of 2-(4-Methylbenzamido)acetic acid The title of the article was Comparison of Biomarkers of Tobacco Exposure between Premium and Discount Brand Cigarette Smokers in the NHANES 2011-2012 Special Sample. And the article contained the following:

Background: Increased cigarette costs have inadvertently strengthened the appeal of discounted brands to price-sensitive smokers. Although smokers perceive discounted brands as having poorer quality, little is known about their delivery of toxic tobacco smoke constituents compared with premium-branded tobacco products. Methods: We investigated the differences between discount and premium brand smokers using the National Health and Nutrition Examination Survey 2011-2012 Special Smoker Sample. Our analyses focused on demog. differences and 27 biomarkers of harmful and potentially harmful constituents (HPHC) listed by the FDA, including volatile organic compounds, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol and its glucuronide [4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol glucuronide; reported as total NNAL (tNNAL)], metals, and polycyclic aromatic hydrocarbons (PAHs). Data were analyzed using linear regression models adjusting for potential confounders. Results: A total of 976 non-tobacco users and 578 recent cigarette smokers were eligible for anal., of which 141 (26.0% weighted) smoked discount brand cigarettes and 437 (74.0% weighted) smoked premium. Discount brand smokers were older, predominantly non-Hispanic white, and had higher serum cotinine. Discount brand smokers had significantly higher levels of 13 smoking-related biomarkers, including tNNAL, uranium, styrene, xylene, and biomarkers of exposure to PAHs (naphthalene, fluorene, and phenanthrene), compared with premium brand smokers. Conclusions: These findings suggest that discount cigarette use is associated with higher exposure to several carcinogenic and toxic HPHCs. Impact: These results may have important regulatory implications for product standards, as higher exposures could lead to a greater degree of harm. The experimental process involved the reaction of 2-(4-Methylbenzamido)acetic acid(cas: 27115-50-0).Application In Synthesis of 2-(4-Methylbenzamido)acetic acid

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Karpun, Yevhen et al. published their research in Pharmacia (Sofia, Bulgaria) in 2021 |CAS: 79-07-2

The Article related to antimicrobial activity bistriazole thione microorganism, Placeholder for records without volume info and other aspects.Related Products of 79-07-2

Karpun, Yevhen; Parchenko, Volodymyr; Fotina, Tetiana; Demianenko, Denys; Fotin, Anatolii; Nahornyi, Volodymyr; Nahorna, Natalia published an article in 2021, the title of the article was The investigation of antimicrobial activity of some s-substituted bis-1,2,4-triazole-3-thiones.Related Products of 79-07-2 And the article contains the following content:

New S-substituted 4-alkyl-(5-((3-(pyridin-4-yl)-1H-1,2,4-triazole-5-yl)thio)methyl)-4H-1,2,4-triazole-3-thiol derivatives have been designed, synthesized and studied their antimicrobial activity on 11 standard Gram-pos. and Gram-neg. microorganism strains. Their spectral and physicochem. parameters were established using modern comprehensive methods of anal., including 1H NMR spectroscopy, GC-MS and elemental anal.It has been found that compound 2a exhibits strong suppression of 5 test strains (MBC = 15.6 渭g/mL). Compound 4a showed moderate inhibition of Salmonella pullorum, Escherichia coli O2 , Salmonella enteritidis strains (MBC = 31.25 渭g/mL) Compound 6a was sensitive toward ten tested bacteria at 31.25渭g/mL concentration The experimental process involved the reaction of 2-Chloroacetamide(cas: 79-07-2).Related Products of 79-07-2

The Article related to antimicrobial activity bistriazole thione microorganism, Placeholder for records without volume info and other aspects.Related Products of 79-07-2

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Hussein, Ag et al. published their research in Austin Journal of Analytical and Pharmaceutical Chemistry in 2021 |CAS: 144-80-9

The Article related to ulcer index inflammation benzimidazole antiinflammatory, Placeholder for records without volume info and other aspects.Related Products of 144-80-9

Hussein, Ag; Sakr, Hm; Mansour, Am; Ayyad, Rr published an article in 2021, the title of the article was Ulcer index and anti-inflammatory testing of some benzimidazole derivatives.Related Products of 144-80-9 And the article contains the following content:

In this work, we carry out the testing of some Benzimidazole derivatives as anti-inflammatory using Indomethacin 10mg/Kg, diclofenac sodium 7mg/Kg, celecoxib 100mg/Kg and tested compounds of 200mg/Kg. The tested compounds showed anti-inflammatory activity in comparison with the standard reference drugs. In addnl., carrying out the testing of ulcer index for some testing compounds 600mg/Kg comparing with indomethacin 100mg/Kg, the testing revealed indomethacin causes ulcer in stomach of the testing animals, while the testing compounds no ulcerated the stomach of the testing animal. The experimental process involved the reaction of N-((4-Aminophenyl)sulfonyl)acetamide(cas: 144-80-9).Related Products of 144-80-9

The Article related to ulcer index inflammation benzimidazole antiinflammatory, Placeholder for records without volume info and other aspects.Related Products of 144-80-9

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Threlfall, T. et al. published their research in Vibrational Spectroscopy in 2022 |CAS: 79-07-2

The Article related to primary carboxamide stretching vibration ir spectra, Placeholder for records without volume info and other aspects.Related Products of 79-07-2

On July 31, 2022, Threlfall, T. published an article.Related Products of 79-07-2 The title of the article was The infrared spectra of amides. Part 1. The stretching vibrations of primary carboxamides. And the article contained the following:

The IR spectra of more than 150 primarycarboxamides in the NH stretching and the carbonyl region have been measured. Comparison is made with Bellamys anal. of the stretching modes of amines. The offset to higher frequencies of amides compared with amines is attributed to the widening of the bond angle. The sym. and antisym. stretching of the NH2 bonds is analyzed via a rearrangement of the Linnett equations. It is shown thereby that changes of bond strength vary the sym. and antisym. frequencies approx. proportionately while deviations from that relationship are due either to changes of the bond angle, steric hindrance or to hydrogen bonding. The spectral changes of m- and p-substituted amides are correlated with Hammett sigma functions, both in the carbonyl and the NH2 stretching region. Intensities and the influence of steric effects are also discussed. The experimental process involved the reaction of 2-Chloroacetamide(cas: 79-07-2).Related Products of 79-07-2

The Article related to primary carboxamide stretching vibration ir spectra, Placeholder for records without volume info and other aspects.Related Products of 79-07-2

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Borowiecki, Pawel et al. published their research in RSC Advances in 2022 |CAS: 5455-98-1

The Article related to adrenergic betha blocker one pot two step procedure, Placeholder for records without volume info and other aspects.Application In Synthesis of 2-(Oxiran-2-ylmethyl)isoindoline-1,3-dione

Borowiecki, Pawel; Zdun, Beata; Popow, Natalia; Wiklinska, Magdalena; Reiter, Tamara; Kroutil, Wolfgang published an article in 2022, the title of the article was Development of a novel chemoenzymatic route to enantiomerically enriched 尾-adrenolytic agents. A case study toward propranolol, alprenolol, pindolol, carazolol, moprolol, and metoprolol.Application In Synthesis of 2-(Oxiran-2-ylmethyl)isoindoline-1,3-dione And the article contains the following content:

Efficient chemoenzymic routes toward the synthesis of both enantiomers of adrenergic beta-blockers were accomplished by identifying a central chiral building block, which was first prepared using lipase-catalyzed kinetic resolution (KR, Amano PS-IM) as the asym. step at a five gram-scale (209 mM concentrate). The enantiopure (R)-chlorohydrin (>99% ee) subsequently obtained was used for the synthesis of a series of model (R)-(+)-beta-blockers (i.e., propranolol, alprenolol, pindolol, carazolol, moprolol, and metoprolol), which were produced with enantiomeric excess in the range of 96-99.9%. The pharmaceutically relevant (S)-counterpart, taking propranolol as a model, was synthesized in excellent enantiomeric purity (99% ee) via acetolysis of the resp. enantiomerically pure (R)-mesylate by using cesium acetate and a catalytic amount of 18-Crown-6, followed by acidic hydrolysis of the formed (S)-acetate. Alternatively, asym. reduction of a prochiral ketone, namely 2-(3-chloro-2-oxopropyl)-1H-isoindole-1,3(2H)-dione, was performed using lyophilized E. coli cells harboring overexpressed recombinant alc. dehydrogenase from Lactobacillus kefir (E. coli/Lk-ADH-Lica) giving the corresponding chlorohydrin with >99% ee. Setting the stereocenter early in the synthesis and performing a 4-step reaction sequence in a 鈥瞣ne-pot two-step鈥?procedure allowed the design of a 鈥瞫tep-economic鈥?route with a potential dramatic improvement in process efficiency. The synthetic method can serve for the preparation of a broad scope of enantiomerically enriched beta-blockers, the chem. structures of which rely on the common 伪-hydroxy-N-isopropylamine moiety, and in this sense, might be industrially attractive. The experimental process involved the reaction of 2-(Oxiran-2-ylmethyl)isoindoline-1,3-dione(cas: 5455-98-1).Application In Synthesis of 2-(Oxiran-2-ylmethyl)isoindoline-1,3-dione

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics