Tag: 100-200

On September 30, 1988, Urtane, I.; Zelcans, G.; Lukevics, E.; Mazeika, I.; Gaukhman, A. P. published an article.Electric Literature of 2160-93-2 The title of the article was Synthesis and mass spectra of spirocyclic silicon ethers of diethanolamines. And the article contained the following:

Heating Si(OMe)4 or Si(OEt)4 with glycols Z(OH)2 [Z = CH2CH2, (CH2)3, CMe2CMe2, C(CF3)2C(CF3)2, CMe2CH2CMe2; CMe2CH2CMeR, R = nonyl] and diethanolamines (HOCHR1CH2)2NR2 (R1 = H, Me; R2 = H, Me, CMe3) gave 29-100% of 13 asym. spirocyclic ethers I (same Z, R1, R2). Heating Si(OMe)4 with (HOCHMeCH2)2NMe or with (Me3SiOCH2CH2)2NPh gave 33-36% sym. spirocyclic ethers I [Z = R2N(CH2CHR1O)2; R1 = R2 = Me; R1 = H, R2 = Ph], resp. Mass spectral fragmentation patterns for I indicate a pronounced transannular N→Si bond in the mixed spirocycles and a much weaker one in the sym. spirocycles. The experimental process involved the reaction of 2,2′-(tert-Butylazanediyl)diethanol(cas: 2160-93-2).Electric Literature of 2160-93-2

The Article related to spirocyclic silicon ether preparation mass spectrum, diethanolamine cyclocondensation alkoxysilane glycol, transannular nitrogen silicon bond spirocycle, Organometallic and Organometalloidal Compounds: Silicon Compounds and other aspects.Electric Literature of 2160-93-2

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Anisimov, Anton A.; Temnikov, Maxim N.; Krizhanovskiy, Ilya; Timoshina, Ekaterina I.; Milenin, Sergey A.; Peregudov, Alexander S.; Dolgushin, Fedor M.; Muzafarov, Aziz M. published an article in 2021, the title of the article was A thiol-ene click reaction with preservation of the Si-H bond: a new approach for the synthesis of functional organosilicon compounds.COA of Formula: C10H22S And the article contains the following content:

This work presents an approach for the preparation of functional hydrosilanes. The essence of the method is a thiol-ene click reaction on vinyl or allylsilanes. In this case, the Si-H bond in the substrate mol. is not affected. The reaction proceeds with radical (AIBN) or UV initiation with yields close to quant. This makes it possible to obtain aliphatic, aromatic, carboxyl and alkoxysilyl derivatives of the corresponding silanes. Crystalline tris(3-(phenylthio)propyl) silane was obtained and characterized for the first time. In the case when the thiol-ene reaction leads to the formation of a three-dimensional network, it was possible to obtain Si-H-containing materials – a transparent monolith and an aerogel with a d. of 0.26 g ml-1. The experimental process involved the reaction of 1-Decanethiol(cas: 143-10-2).COA of Formula: C10H22S

The Article related to crystal structure mol hydrosilane preparation, thiolene click reaction vinyl allyl silane silicon hydrogen bond, Organometallic and Organometalloidal Compounds: Silicon Compounds and other aspects.COA of Formula: C10H22S

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On November 15, 2019, Wong, Nicholas; Petronijevic, Filip; Hong, Allen Y.; Linghu, Xin; Kelly, Sean M.; Hou, Haiyun; Cravillion, Theresa; Lim, Ngiap-Kie; Robinson, Sarah J.; Han, Chong; Molinaro, Carmela; Sowell, C. Gregory; Gosselin, Francis published an article.HPLC of Formula: 32462-30-9 The title of the article was Stereocontrolled synthesis of arylomycin-based gram-negative antibiotic GDC-5338. And the article contained the following:

We report herein an efficient, stereocontrolled, and chromatog.-free synthesis of the novel broad spectrum antibiotic GDC-5338. The route features the construction of a functionalized tripeptide backbone, a high-yielding macrocyclization via a Pd-catalyzed Suzuki-Miyaura reaction, and the late-stage elaboration of key amide bonds with minimal stereochem. erosion. Through extensive reaction development and anal. understanding, these key advancements allowed the preparation of GDC-5338 in 17 steps, 15% overall yield, >99 A % HPLC, and >99:1 dr. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).HPLC of Formula: 32462-30-9

The Article related to peptide antibiotic arylomycin based gdc5338 stereocontrolled synthesis crystal structure, tripeptide macrocyclization suzuki miyaura reaction palladium catalyst, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.HPLC of Formula: 32462-30-9

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Dufour, Jeremy; Neuville, Luc; Zhu, Jieping published an article in 2010, the title of the article was Intramolecular Suzuki-Miyaura reaction for the total synthesis of signal peptidase inhibitors, arylomycins A2 and B2.Name: H-Phg(4-OH)-OH And the article contains the following content:

Development of the total syntheses of arylomycins A1 and B2 is detailed. Key features of our approach include (1) formation of 14-membered meta,meta-cyclophane by an intramol. Suzuki-Miyaura reaction; (2) incorporation of N-Me-4-hydroxyphenylglycine into the cyclization precursor, which avoids the late-stage low-yielding N-methylation step; (3) segment coupling of a fully elaborated peptide side chain to the macrocycle, which makes the synthesis highly convergent. Overall, arylomycin A2 was obtained in 13 steps from L-Tyr for the longest linear sequence, in 13 % overall yield. Arylomycin B2 was synthesized in 10 steps from L-3-nitro-Tyr, in 10 % overall yield. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Name: H-Phg(4-OH)-OH

The Article related to cyclic peptide arylomycin total synthesis signal peptidase inhibitor rotamer, suzuki miyaura coupling methylhydroxyphenylglycine cyclization peptide coupling, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.Name: H-Phg(4-OH)-OH

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On April 2, 2021, Tailor, Sanita B.; Manzotti, Mattia; Smith, Gavin J.; Davis, Sean A.; Bedford, Robin B. published an article.Related Products of 78-26-2 The title of the article was Cobalt-Catalyzed Coupling of Aryl Chlorides with Aryl Boron Esters Activated by Alkoxides. And the article contained the following:

The cobalt-catalyzed Suzuki biaryl cross-coupling of aryl chloride substrates with aryl boron reagents, activated with more commonly used bases, remained a significant unmet challenge in the race to replace platinum group metal catalysts with Earth-abundant metal alternatives. This highly desirable process can be realized using alkoxide bases, provided the right counterion is employed, strict stoichiometric control of the base is maintained with respect to the aryl boron reagent, and the correct boron ester is selected. Potassium tert-butoxide works well, but any excess of the base first inhibits and then poisons the catalyst. Lithium tert-butoxide performs very poorly, while even catalytic amounts of lithium additives also poison the catalyst. Meanwhile, a neopentane diol-based boron ester is required for best performance. As well as delivering this sought-after transformation, a detailed mechanistic and computational investigations to probe the possible mechanism of the reaction has been discussed and explains the unexpected exptl. observations. The experimental process involved the reaction of 2-Methyl-2-propylpropane-1,3-diol(cas: 78-26-2).Related Products of 78-26-2

The Article related to biaryl preparation transmetalation key step kinetics linear free energy, aryl chloride boron reagent alkoxide suzuki coupling cobalt catalyst, Benzene, Its Derivatives, and Condensed Benzenoid Compounds: Others and other aspects.Related Products of 78-26-2

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On October 8, 2015, Weigel, Lena F.; Nitsche, Christoph; Graf, Dominik; Bartenschlager, Ralf; Klein, Christian D. published an article.Safety of H-Phg(4-OH)-OH The title of the article was Phenylalanine and Phenylglycine Analogues as Arginine Mimetics in Dengue Protease Inhibitors. And the article contained the following:

Dengue virus is an increasingly global pathogen. One of the promising targets for antiviral drug discovery against dengue and related flaviviruses such as West Nile virus is the viral serine protease NS2B-NS3. We here report the synthesis and in vitro characterization of potent peptidic inhibitors of dengue virus protease that incorporate phenylalanine and phenylglycine derivatives as arginine-mimicking groups with modulated basicity. The most promising compounds were (4-amidino)-L-phenylalanine-containing inhibitors, which reached nanomolar affinities against dengue virus protease. The type and position of the substituents on the phenylglycine and phenylalanine side chains has a significant effect on the inhibitory activity against dengue virus protease and selectivity against other proteases. In addition, the non-natural, basic amino acids described here may have relevance for the development of other peptidic and peptidomimetic drugs such as inhibitors of the blood clotting cascade. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Safety of H-Phg(4-OH)-OH

The Article related to phenylalanine phenylglycine based arginine mimetic tripeptide preparation antiviral, dengue protease inhibitor tripeptide arginine mimetic, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.Safety of H-Phg(4-OH)-OH

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On November 1, 2013, Gaudelli, Nicole M.; Townsend, Craig A. published an article.Synthetic Route of 32462-30-9 The title of the article was Stereocontrolled Syntheses of Peptide Thioesters Containing Modified Seryl Residues as Probes of Antibiotic Biosynthesis [Erratum to document cited in CA159:134091]. And the article contained the following:

The Supporting Information contained incorrectly placed NMR spectra for six figures; the corrected files are now included online. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Synthetic Route of 32462-30-9

The Article related to erratum serine phosphoserine beta lactam peptide thioester preparation, nocardicin epimerization erratum, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.Synthetic Route of 32462-30-9

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On July 5, 2013, Gaudelli, Nicole M.; Townsend, Craig A. published an article.Safety of H-Phg(4-OH)-OH The title of the article was Stereocontrolled Syntheses of Peptide Thioesters Containing Modified Seryl Residues as Probes of Antibiotic Biosynthesis. And the article contained the following:

Methods have been developed to synthesize tri- and pentapeptide thioesters containing one or more p-(hydroxyphenyl)glycine (pHPG) residues and L-serine, some where the latter is O-phosphorylated, O-acetylated, or exists as a β-lactam. Selection of orthogonal protection strategies and development of conditions to achieve seryl O-phosphorylation without β-elimination and to maintain stereochem. control, especially simultaneously at exceptionally base-labile pHPG α-carbons, are described. Intramol. closure of a seryl peptide to a β-lactam-containing peptide and the syntheses of corresponding thioester analogs are also reported. Modification of classical Mitsunobu conditions is described in the synthesis of the β-lactam-containing products, and in a broadly useful observation, it was found that simple exclusion of light from the P(OEt)3-mediated Mitsunobu ring closure afforded yields of >95%, presumably owing to reduced photodegradation of the azodicarboxylate used. These sensitive potential substrates and products will be used in mechanistic studies of the two nonribosomal peptide synthetases NocA and NocB that lie at the heart of nocardicin biosynthesis, a family of monocyclic β-lactam antibiotics. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Safety of H-Phg(4-OH)-OH

The Article related to serine phosphoserine beta lactam peptide thioester preparation nocardicin epimerization, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.Safety of H-Phg(4-OH)-OH

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On December 10, 2015, Behnam, Mira A. M.; Graf, Dominik; Bartenschlager, Ralf; Zlotos, Darius P.; Klein, Christian D. published an article.Name: H-Phg(4-OH)-OH The title of the article was Discovery of Nanomolar Dengue and West Nile Virus Protease Inhibitors Containing a 4-Benzyloxyphenylglycine Residue. And the article contained the following:

The dengue virus (DENV) and West Nile Virus (WNV) NS2B-NS3 proteases are attractive targets for the development of dual-acting therapeutics against these arboviral pathogens. We present the synthesis and extensive biol. evaluation of inhibitors that contain benzyl ethers of 4-hydroxyphenylglycine as non-natural peptidic building blocks synthesized via a copper-complex intermediate. A three-step optimization strategy, beginning with fragment growth of the C-terminal 4-hydroxyphenylglycine to the benzyloxy ether, followed by C- and N-terminal optimization, and finally fragment merging generated compounds with in vitro affinities in the low nanomolar range. The most promising derivative reached Ki values of 12 nM at the DENV-2 and 39 nM at the WNV proteases. Several of the newly discovered protease inhibitors yielded a significant reduction of dengue and West Nile virus titers in cell-based assays of virus replication, with an EC50 value of 3.4 μM at DENV-2 and 15.5 μM at WNV for the most active analog. The experimental process involved the reaction of H-Phg(4-OH)-OH(cas: 32462-30-9).Name: H-Phg(4-OH)-OH

The Article related to hydroxyphenylglycine peptide preparation protease inhibitor dengue west nile virus, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.Name: H-Phg(4-OH)-OH

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Petryk, Malgorzata; Janiak, Agnieszka; Kwit, Marcin published an article in 2017, the title of the article was Unexpected formation of a tubular architecture by optically active pure organic calixsalen.Name: 2,5-Dihydroxyisophthalaldehyde And the article contains the following content:

Herein, an unusual tubular formation of a supramol. organic framework by optically active macrocyclic calixsalen is shown via single crystal X-ray diffraction. The monomers are either bound by hydrogen bonds between OH groups in the lower rim of the macrocycle to form an hourglass structure or form a capsule with the calixsalens arranged in a head-to-head motif. The experimental process involved the reaction of 2,5-Dihydroxyisophthalaldehyde(cas: 109486-06-8).Name: 2,5-Dihydroxyisophthalaldehyde

The Article related to optically active calixsalen aggregation hydrogen bond dimerization, Physical Organic Chemistry: Other Reactions, Processes, and Spectra and other aspects.Name: 2,5-Dihydroxyisophthalaldehyde

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