Category: amides-buliding-blocks

Hu, Xiafei; Chen, Xiangxiang; Li, Bo; He, Gang; Chen, Gong published an article on February 5 ,2021. The article was titled 《Construction of peptide macrocycles via radical-mediated intramolecular C-H alkylations》, and you may find the article in Organic Letters.Quality Control of H-Lys(Boc)-OH The information in the text is summarized as follows:

Enzyme-catalyzed radical-mediated C-H functionalization reactions allow nature to create natural products of unusual three-dimensional structures from simple linear peptide precursors. In comparison, chemist’s ability to harness radical C-H functionalization reactions for synthesis of complex peptides remains limited. In this work, new methods have been developed to construct peptide macrocycles via radical-mediated intramol. C-H alkylation reactions under photoredox catalysis. Linear peptide precursors equipped with a C-terminal N-(acyloxy)phthalimide ester can cyclize with the α C-H bond of N-terminal glycine or aryl C-H bond of N-heteroarene capping units in high yield and selectivity under mild conditions. The strategy uses the C-H cyclization step to incorporate lysine, homolysine, and various heteroarene-derived amino acid linchpins into peptide macrocycles, enabling convergent and flexible synthesis of complex peptide macrocycles from simple building blocks. The results came from multiple reactions, including the reaction of H-Lys(Boc)-OH(cas: 2418-95-3Quality Control of H-Lys(Boc)-OH)

H-Lys(Boc)-OH(cas: 2418-95-3) belongs to amino acids. In addition to subunits of proteins, amino acids have many other functions as well, including osmoregulation (proline), neurotransmitters (gamma-aminobutyric acid), metabolic intermediates (ornithine and citrulline), and inhibitors (dehydroproline).Quality Control of H-Lys(Boc)-OH

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

Goetz, D. H.; Choe, Y.; Hansell, E.; Chen, Y. T.; McDowell, M.; Jonsson, C. B.; Roush, B. C.; McKerrow, J.; Craik, C. S. published an article in Biochemistry. The title of the article was 《Substrate Specificity Profiling and Identification of a New Class of Inhibitor for the Major Protease of the SARS Coronavirus》.Application In Synthesis of (S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide The author mentioned the following in the article:

Severe acute respiratory syndrome (SARS) is an emerging infectious disease associated with a high rate of mortality. The SARS-associated coronavirus (SARS-CoV) has been identified as the etiol. agent of the disease. Although public health procedures have been effective in combating the spread of SARS, concern remains about the possibility of a recurrence. Various approaches are being pursued for the development of efficacious therapeutics. One promising approach is to develop small mol. inhibitors of the essential major polyprotein processing protease 3Clpro. Here we report a complete description of the tetrapeptide substrate specificity of 3Clpro using fully degenerate peptide libraries consisting of all 160 000 possible naturally occurring tetrapeptides. The substrate specificity data show the expected P1-Gln P2-Leu specificity and elucidate a novel preference for P1-His containing substrates equal to the expected preference for P1-Gln. These data were then used to develop optimal substrates for a high-throughput screen of a 2000 compound small-mol. inhibitor library consisting of known cysteine protease inhibitor scaffolds. We also report the 1.8 Å X-ray crystal structure of 3Clpro bound to an irreversible inhibitor. This inhibitor, an α,β-epoxyketone, inhibits 3Clpro with a k3/Ki of 0.002 μM-1 s-1 in a mode consistent with the substrate specificity data. Finally, we report the successful rational improvement of this scaffold with second generation inhibitors. These data provide the foundation for a rational small-mol. inhibitor design effort based upon the inhibitor scaffold identified, the crystal structure of the complex, and a more complete understanding of P1-P4 substrate specificity. After reading the article, we found that the author used (S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide(cas: 87694-50-6Application In Synthesis of (S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide)

(S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide(cas: 87694-50-6) belongs to amides. Because of the greater electronegativity of oxygen, the carbonyl (C=O) is a stronger dipole than the N–C dipole. The presence of a C=O dipole and, to a lesser extent a N–C dipole, allows amides to act as H-bond acceptors.“,” In primary and secondary amides, the presence of N–H dipoles allows amides to function as H-bond donors as well. Application In Synthesis of (S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide

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

Application of 87694-50-6On October 2, 2003 ,《An epoxide ring-opening reaction via hypervalent silicate intermediate: Synthesis of statine》 was published in Synthesis. The article was written by Konno, Hiroyuki; Toshiro, Emi; Hinoda, Naoyuki. The article contains the following contents:

The azide- and cyanide-opening reaction of epoxide with TBAF and TMSN3 in THF or TBAF and TMSCN in MeCN occurred regioselectively to afford β-hydroxy azides and cyanides in good yield. These hypervalent silicates are highly effective as nucleophilic azide and cyanide donors under mild conditions. This methodol. was applied to the preparation of statine. In the part of experimental materials, we found many familiar compounds, such as (S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide(cas: 87694-50-6Application of 87694-50-6)

(S)-N-Methyl-N-methoxy-2-(tert-butoxycarbonylamino)-4-methylpentanamide(cas: 87694-50-6) belongs to amides. Because of the greater electronegativity of oxygen, the carbonyl (C=O) is a stronger dipole than the N–C dipole. The presence of a C=O dipole and, to a lesser extent a N–C dipole, allows amides to act as H-bond acceptors.“,” In primary and secondary amides, the presence of N–H dipoles allows amides to function as H-bond donors as well. Application of 87694-50-6

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

Related Products of 2418-95-3On November 30, 2020 ,《Syntheses of enantiopure 1,2-ethylenediamines with tethered secondary amines of the formula H2NCH2CH[(CH2)nNHMe]NH2 (n = 1 – 4) from α-amino acids: New agents for asymmetric catalysis》 appeared in Synthesis. The author of the article were Kabes, Connor Q.; Gunn, Jack H.; Selbst, Maximilian A.; Lucas, Reagan F.; Gladysz, John A.. The article conveys some information:

Tris(hydrochloride) adducts of the title compounds are prepared from the inexpensive α-amino acids H2N(C:O)CH2CH(NH2)CO2H, HO(C:O)(CH2)nCH(NH 2)CO 2H (n = 1, 2), and H2N(CH2)4CH(NH2)CO2H, resp. (steps/overall yield = 5/32%, 7/30%, 7/33%, 5/38%). The NH2 group that is remote from the secondary amine is installed via BH3 reduction of an amide [(C=O)NR2] derived from an α-amino carboxylic acid. The MeNHCH2 units are introduced by BH3 reductions of alkyl carbamate [RO(C:O)NHCH2; R = Et, t-Bu] or amide [MeHN(C:O)] moieties. In the experiment, the researchers used many compounds, for example, H-Lys(Boc)-OH(cas: 2418-95-3Related Products of 2418-95-3)

H-Lys(Boc)-OH(cas: 2418-95-3) belongs to amino acids. These amino acids may be present in low concentrations and play a vital part as an intermediate in a biosynthetic pathway, e.g., ornithine, homoserine, or cystathionine. In contrast they may act as a major storage form of nitrogen, e.g., canavanine in the seed of Canavalia ensiformis, or may be formed in high amounts in response to an external stress, e.g., γ-aminobutyrate.Related Products of 2418-95-3 It is possible that some of these nonprotein amino acids may serve as insecticidal or fungicidal agents.

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

《Chemical synthesis of transactivation domain (TAD) of tumor suppressor protein p53 by native chemical ligation of three peptide segments》 was written by Baral, Abhishek; Asokan, Aromal; Bauer, Valentin; Kieffer, Bruno; Torbeev, Vladimir. Safety of 2-BromoacetamideThis research focused ontransactivation domain tumor suppressor protein p53 total synthesis NMR; solid phase peptide synthesis thioesterification native chem ligation alkylation; post translational modification protein folding binding NCBD conformation CD; NCBD nuclear coactivator binding domain CREB binding protein. The article conveys some information:

Chem. composition of tumor suppressor protein p53 is altered via multiple post-translational modifications which modulate its cellular lifetime and interactions with other biomols. Here we report total chem. synthesis of a 61-residue form of transactivation domain (TAD) of p53 based on native chem. ligation of three peptide segments. The experiments to characterize its binding to nuclear co-activator binding domain (NCBD) of CREB-binding protein confirmed native-like induced folding upon binding to NCBD. Thus, the synthetic approach described herein can be useful for the preparation of various post-translationally modified analogs of TAD-p53 for further functional biochem. and biophys. studies. The results came from multiple reactions, including the reaction of 2-Bromoacetamide(cas: 683-57-8Safety of 2-Bromoacetamide)

2-Bromoacetamide(cas: 683-57-8) can be used in preparation of (2-carbamoylmethoxy-5-chloro-benzyl)-carbamic acid tert-butyl ester. It was aslo used as precursor to dehydropeptidase I inactivator.Safety of 2-Bromoacetamide

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

In 2022,Zhen, Jingsong; Du, Xian; Xu, Xiaohong; Li, Yihui; Yuan, Han; Xu, Dejing; Xue, Can; Luo, Yong published an article in ACS Catalysis. The title of the article was 《Visible-Light-Mediated Late-Stage Sulfonylation of Boronic Acids via N-S Bond Activation of Sulfonamides》.Electric Literature of C7H9NO2S The author mentioned the following in the article:

A visible-light-mediated late-stage arylation of N-S bonds in sulfonamides was developed with using readily available imines as sulfonyl radical source. Diverse complex sulfones could be synthesized by prefunctionalization and subsequent N-S bond arylation, demonstrating the advantages of using sulfonamides as sulfonylation reagents. Addnl., the mechanism research revealed that probably both EDA complex chem. and photoredox catalysis were responsible for the formation of sulfones. This methodol. characterized by broad substrate scope and simple reaction conditions also has high atom economy, since the aldehyde for the synthesis of imines could be recovered after workup of the reactions. In the experiment, the researchers used 4-Methylbenzenesulfonamide(cas: 70-55-3Electric Literature of C7H9NO2S)

4-Methylbenzenesulfonamide(cas: 70-55-3) belongs to anime. Amine, any member of a family of nitrogen-containing organic compounds that is derived, either in principle or in practice, from ammonia (NH3). Naturally occurring amines include the alkaloids, which are present in certain plants; the catecholamine neurotransmitters (i.e., dopamine, epinephrine, and norepinephrine); and a local chemical mediator, histamine, that occurs in most animal tissues.Electric Literature of C7H9NO2S

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

Qian, Yunkun; Chen, Yanan; Hu, Yue; Hanigan, David; Westerhoff, Paul; An, Dong published their research in Water Research in 2021. The article was titled 《Formation and control of C- and N-DBPs during disinfection of filter backwash and sedimentation sludge water in drinking water treatment》.Synthetic Route of C2H4BrNO The article contains the following contents:

Drinking water treatment plants (DWTPs) produce filter backwash water (FBW) and sedimentation sludge water (SSW) that may be partially recycled to the head of DWTPs. The impacts of key disinfection conditions, water quality parameters (e.g., disinfection times, disinfectant types and doses, and pH values), and bromide concentration on controlling the formation of trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), and haloacetamides (HAMs) during disinfection of FBW and SSW were investigated. Concentrations of most disinfection byproducts (DBPs) and associated calculated toxicity increased with extended chlorination for both FBW and SSW. During chlorination of both FBW and SSW, elevated chlorine doses significantly increased THM yields per unit dissolved organic carbon (DOC), but decreased HAN and HAM yields, with min. effect on HAA yields. Chloramine disinfection effectively inhibited C-DBP formation but promoted N-DBPs yields, which increased with chloramine dose. Calculated toxicities after chloramination increased with chloramine dose, which was opposite to the trend found after free chlorine addition An examination of pH effects demonstrated that C-DBPs were more readily generated at alk. pH (pH=8), while acidic conditions (pH=6) favored N-DBP formation. Total DBP concentrations increased at higher pH levels, but calculated DBP toxicity deceased due to lower HAN and HAM concentrations Addition of bromide markedly increased bromo-THM and bromo-HAN formation, which are more cytotoxic than chlorinated analogs, but had little impact on the formation of HAAs and HAMs. Bromide incorporation factors (BIFs) for THMs and HANs from both water samples all significantly increased as bromide concentrations increased. Overall, high bromide concentrations increased the calculated toxicity values in FBW and SSW after chlorination. Therefore, while currently challenging, technologies capable of removing bromide should be explored as part of a strategy towards controlling cumulative toxicity burden (i.e., hazard) while simultaneously lowering individual DBP concentrations (i.e., exposure) to manage DBP risks in drinking water. In the experiment, the researchers used many compounds, for example, 2-Bromoacetamide(cas: 683-57-8Synthetic Route of C2H4BrNO)

2-Bromoacetamide(cas: 683-57-8) can be used in preparation of (2-carbamoylmethoxy-5-chloro-benzyl)-carbamic acid tert-butyl ester. It was aslo used as precursor to dehydropeptidase I inactivator.Synthetic Route of C2H4BrNO

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

《Haloacetonitriles and haloacetamides precursors in filter backwash and sedimentation sludge water during drinking water treatment》 was written by Qian, Yunkun; Hu, Yue; Chen, Yanan; An, Dong; Westerhoff, Paul; Hanigan, David; Chu, Wenhai. Formula: C2H4BrNO And the article was included in Water Research in 2020. The article conveys some information:

Haloacetonitriles (HANs) and haloacetamides (HAMs) are nitrogenous disinfection byproducts that are present in filter backwash water (FBW) and sedimentation sludge water (SSW). In many cases FBW and SSW are recycled to the head of drinking water treatment plants. HAN and HAM concentrations in FBW and SSW, without addnl. oxidants, ranged from 6.8 to 11.6 nM and 2.9 to 3.6 nM of three HANs and four HAMs, resp. Upon oxidant addition to FBW and SSW under formation potential conditions, concentrations for six HANs and six HAMs ranged from 92.2 to 190.4 nM and 42.2 to 95.5 nM, resp. Therefore, at common FBW and SSW recycle rates (2 to 10% of treated water flows), the precursor levels in these recycle waters should not be ignored because they are comparable to levels present in finished water. Brominated HAN and chlorinated HAM were the dominant species in FBW and SSW, resp. The lowest mol. weight ultrafiltration fraction (< 3 kDa) contributed the most to HAN and HAM formations. The hydrophilic (HPI) organic fraction contributed the greatest to HAN precursors in sand-FBW and SSW and were the most reactive HAM precursors in both sand- or carbon-FBWs. Fluorescence revealed that aromatic protein-like compounds were dominant HAN and HAM precursors. Therefore, strategies that remove low mol. weight hydrophilic organic matter and aromatic protein-like compounds will minimize HAN and HAM formations in recycled FBW and SSW. The experimental process involved the reaction of 2-Bromoacetamide(cas: 683-57-8Formula: C2H4BrNO)

2-Bromoacetamide(cas: 683-57-8) can be used in preparation of (2-carbamoylmethoxy-5-chloro-benzyl)-carbamic acid tert-butyl ester. It was aslo used as precursor to dehydropeptidase I inactivator.Formula: C2H4BrNO

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

The author of 《NHC ligand-enabled Ni-catalyzed reductive coupling of alkynes and imines using isopropanol as a reductant》 were Yao, Wei-Wei; Li, Ran; Li, Jiang-Fei; Sun, Juan; Ye, Mengchun. And the article was published in Green Chemistry in 2019. Computed Properties of C7H9NO2S The author mentioned the following in the article:

A nickel-catalyzed reductive coupling of alkynes and imines using readily available isopropanol as the reducing agent was developed. The use of a sterically bulky and electron-rich carbene ligand compound I significantly promoted the reaction, providing various multi-substituted allylic amines in 23-89% yield and the corresponding chiral ligand compound II afforded the products in 51-95% ee. The experimental part of the paper was very detailed, including the reaction process of 4-Methylbenzenesulfonamide(cas: 70-55-3Computed Properties of C7H9NO2S)

4-Methylbenzenesulfonamide(cas: 70-55-3) belongs to anime. To avoid the problem of multiple alkylation, methods have been devised for “blocking” substitution so that only one alkyl group is introduced. The Gabriel synthesis is one such method; it utilizes phthalimide, C6H4(CO)2NH, whose one acidic hydrogen atom has been removed upon the addition of a base such as KOH to form a salt.Computed Properties of C7H9NO2S

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

The author of 《Design of a Primary-Amide-Functionalized Highly Efficient and Recyclable Hydrogen-Bond-Donating Heterogeneous Catalyst for the Friedel-Crafts Alkylation of Indoles with β-Nitrostyrenes》 were Markad, Datta; Mandal, Sanjay K.. And the article was published in ACS Catalysis in 2019. Name: 2-Bromoacetamide The author mentioned the following in the article:

A primary-amide-functionalized metal organic framework, {[Zn2(2-BQBG)(BDC)2]·10H2O}n (in which 2-BQBG = 2,2′-(butane-1,4-diylbis((quinolin-2-ylmethyl)azanediyl))diacetamide and BDC = 1,4-benzenedicarboxylate), has been found to be a highly efficient hydrogen-bond-donating (HBD) heterogeneous catalyst for the Friedel-Crafts alkylation of indole with β-nitrostyrenes under mild reaction conditions (catalyst loading: 3 mol %; reaction conditions: 12 h and 35 °C). The catalyst can be easily separated from the reaction mixture by simple filtration for its reuse in four consecutive cycles with very little loss of activity. More importantly, the one-pot room temperature synthesis of {[Zn2(2-BQBG)(BDC)2]·10H2O}n from the self-assembly of Zn(OAc)2·2H2O and 2-BQBG (in CH3OH) and Na2BDC (in H2O) can be easily scaled-up for obtaining multigram quantities in few hours. In order to showcase its versatility, the substrate scope included a variety of substituted indoles and different β-nitrostyrene derivatives forming the desired products in good to high yields. For its catalytic action, a direct proof for the key step in the proposed mechanism, based on the interaction of a primary-amide group in the 2-BQBG ligand with the nitro group of β-nitrostyrene through hydrogen bonding, is provided from the enhancement in fluorescence intensity of {[Zn2(2-BQBG)(BDC)2]·10H2O}n upon successive addition of β-nitrostyrene. After reading the article, we found that the author used 2-Bromoacetamide(cas: 683-57-8Name: 2-Bromoacetamide)

2-Bromoacetamide(cas: 683-57-8) can be used in preparation of (2-carbamoylmethoxy-5-chloro-benzyl)-carbamic acid tert-butyl ester. It was aslo used as precursor to dehydropeptidase I inactivator.Name: 2-Bromoacetamide

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