Category: ethers-buliding-blocks

Royer, Rene published the artcileReactions induced by pyridine hydrochloride. VI. Comparison of the sensitivities to dealkylation by pyridine hydrochloride of alkyl ethers of phenols according to their structures, Safety of 2-Isopropylanisole, the publication is Bulletin de la Societe Chimique de France (1970), 3647-50, database is CAplus.

Increasing the dealkylation temperature of β-naphthyl alkyl ethers or the demethylation temperature of mono- or disubstituted anisoles with pyridinium hydrochloride decreases the effect of steric factors. The demethylation rates and product yields at 155° decreased in the order: PhOMe > o-MeC6H4OMe > o-EtC6H4OMe > o-BuC6H4-OMe; at reflux temperature the demethylation rates of these compounds were similar. The steric factors (proximity, branching of the substituents) are counterbalanced by the inductive effects and to some extent by the symmetry of the ethers. The dealkylation conditions must be optimized for each ether sep.

Bulletin de la Societe Chimique de France published new progress about 2944-47-0. 2944-47-0 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 2-Isopropylanisole, and the molecular formula is C10H14O, Safety of 2-Isopropylanisole.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Nicolaou, K. C. published the artcileSynthesis of iso-epoxy-amphidinolide N and des-epoxy-caribenolide I structures. Revised strategy and final stages, Category: ethers-buliding-blocks, the publication is Organic & Biomolecular Chemistry (2006), 4(11), 2158-2183, database is CAplus and MEDLINE.

A general and highly convergent synthetic route to the macrocyclic core structures of the antitumor agents amphidinolide N and caribenolide I has been developed, and the total synthesis of iso-epoxy-amphidinolide N and des-epoxy-caribenolide I structures is described. Central to the revised strategy was the use of a Horner-Wadsworth-Emmons olefination between a β-ketophosphonate and an aldehyde to construct the C1-C13 sector common to both amphidinolide N and caribenolide I. Stereoselective alkylation allowed for the rapid assembly of the complete caribenolide I carbon skeleton. Key steps in the completion of the synthesis of des-epoxy-caribenolide I structure I included hydrolysis of a sensitive Me ester using Me₃SnOH, followed by regioselective macrolactonization of the resulting diol seco-acid and global deprotection. An analogous sequence of late-stage manoeuvres was used to arrive at the fully deprotected des-epoxy-amphidinolide N framework, obtained as a mixture of hemiacetal II and its bicyclic acetal. Regio- and diastereoselective epoxidation of the C6 methylene group in the bicyclic acetal provided access to iso-epoxy-amphidinolide N stereoisomer. Several of the prepared compounds were tested for cytotoxicity against human tumor cell lines, and none showed activity.

Organic & Biomolecular Chemistry published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Hlouskova, Zuzana published the artcileSynthesis and properties of push-pull imidazole derivatives with application as photoredox catalysts, Computed Properties of 596819-12-4, the publication is ARKIVOC (Gainesville, FL, United States) (2017), 330-342, database is CAplus.

Two new push-pull mols. with imidazole-4,5-dicarbonitrile acceptor, thiophene and 2-methoxythiophene donors with potential use in photoredox catalysis were designed and prepared The synthesis started from com. available imidazole-4,5-dicarbonitrile and its bromination and N-methylation. Subsequent Suzuki-Miyaura cross-coupling with (5-methoxy)thiophene-derived boronic acids afforded target push-pull derivatives Beside common anal. methods, the mol. structure of 5-methoxythiophen-2-yl derivative has also been verified by X-ray anal. DSC analyses showed remarkable thermal stabilities of both target derivatives with Tm and TD values above 150 and 270°C, resp. Fundamental properties and extent of the intramol. charge-transfer were further studied by UV-VIS absorption spectra and DFT calculations Fundamental photoredox properties of target imidazole derivatives were elucidated. Both push-pull mols. were preliminary tested as photoredox catalysts in cross-dehydrogenative coupling reaction between tetrahydroisoquinoline and nitromethane and the results were compared with those obtained by pyrazine-2,3-dicarbonitrile-derived catalyst.

ARKIVOC (Gainesville, FL, United States) published new progress about 596819-12-4. 596819-12-4 belongs to ethers-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Ether,Boronate Esters,Boronic acid and ester, name is 2-(5-Methoxythiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C11H17BO3S, Computed Properties of 596819-12-4.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Canova, Sophie published the artcileRearrangement of Homoallylic Alcohols Induced by DAST, Recommanded Product: (+)-B-Methoxydiisopinocampheylborane, the publication is Organic Letters (2006), 8(10), 2091-2094, database is CAplus and MEDLINE.

Nonracemic α-substituted-β-methoxy homoallylic alcs. RCH(OH)CH(OMe)CH:CH₂ [R = TBDPSOCH₂CH₂, PhCH₂OCH₂CH₂, (R)-TBDPSOCH₂CHMe, (S)-TBDPSOCH₂CHMeCH₂; TBDPS = Me₃CSi(Ph)₂; (I)] undergo diethylaminosulfur trifluoride (DAST)-mediated fluorination and rearrangement on silica gel to provide β,γ-unsaturated aldehydes RCH(CHO)CH:CH₂ [R = TBDPSOCH₂CH₂, PhCH₂OCH₂CH₂, (R)-TBDPSOCH₂CHMe, (S)-TBDPSOCH₂CHMeCH₂; (II)] in 76-90% yields and with good transfer of chirality. II are unstable to prolonged treatment with silica gel, rearranging to the corresponding α,β-unsaturated aldehydes, and are reduced with sodium borohydride to the primary homoallylic alcs. RCH(CH₂OH)CH:CH₂ [R = TBDPSOCH₂CH₂, PhCH₂OCH₂CH₂, (R)-TBDPSOCH₂CHMe, (S)-TBDPSOCH₂CHMeCH₂]. The racemic homoallylic alcs. PhCH₂CH(OH)CH₂CH:CH₂ and TBDPSOCH₂CH₂CH(OH)CH₂CH:CH₂ lacking an α-methoxy substituent undergo fluorination without rearrangement; reaction of the secondary alc. derived from I [R = (R)-TBDPSOCH₂CHMe] by hydrogenation of the olefin with DAST yields a complex mixture

Organic Letters published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Recommanded Product: (+)-B-Methoxydiisopinocampheylborane.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Barrulas, Pedro published the artcileSynthesis of novel cinchona-amino acid hybrid organocatalysts for asymmetric catalysis, Name: (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is Tetrahedron: Asymmetry (2014), 25(12), 923-935, database is CAplus.

Three novel subclasses of cinchonidine derivatives coupled to diverse amino acids were prepared in very good overall yield and tested in a benchmark organocatalytic aldol reaction, between acetone and aromatic aldehydes. These subclasses are a family of amino acid-cinchonidine (subclass A), N-formamides-cinchonidine (subclass B) and dipeptide-cinchonidine (subclass C) hybrids. The main goal, besides obtaining very good yield and enantioselectivity was to understand the influence of the amino acid side chain residues on the enantioselectivity of the asym. aldol reactions. Different amino acid tethered cinchonidine hybrids were compared and their catalytic behavior was evaluated, allowing good enantioselectivity to be achieved, 92% ee in one case. Other reactions such as Biginelli, Michael addition and ketimine hydrosilylation reactions were screened with these ligands, but the outcome was less successful. The synthesis of the target compounds (organocatalysts) was achieved by a reaction of (8α,9S)-cinchonan-9-amine [epi-(amino)cinchonidine] with amino acids, such as N-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-phenylalanine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]glycine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]–L-valine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]–L-tyrosine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-alloisoleucine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-λ-methionine. The title compounds thus formed included chiral cinchona-alkaloid-amino acid derivatives, such as (2S)-2-amino-N-(8α,9S)-cinchonan-9-yl-3,3-(dimethyl)butanamide [i.e., N-[(9H-fluoren-9-ylmethoxy)carbonyl]-3-(methyl)-L-valine derivative], (2S)-N-[(8α,9S)-cinchonan-9-yl]-2-pyrrolidinecarboxamide (L-proline derivative).

Tetrahedron: Asymmetry published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Name: (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Archibald, John L. published the artcileBenzamidopiperidines. 2. Heterocyclic compounds related to indoramin, Category: ethers-buliding-blocks, the publication is Journal of Medicinal Chemistry (1974), 17(7), 736-9, database is CAplus and MEDLINE.

A series of 19 title compounds prepared from 4-benzamidopiperidine [33953-37-6] by alkylation, acylation, Mannich or Michael-type reactions, or ring closure reactions were evaluated for hypotensive activity in anesthetized normotensive rats and antihypertensive activity in conscious renal hypertensive rats. The most active hypotensive compounds were I, R = 2-hydroxy-2-pyrrol-2-ylethyl [36793-50-7] and I, R = 2-(2-quinolyl)ethyl [36793-54-1]. The most active antihypertensive compounds were I, R = 2-(4-pyridyl)ethyl [36793-45-0], I, R = 2-(2-pyridyl)ethyl [36806-71-0], I, R = 2-(3-benzo[b]thienyl)ethyl [36793-52-9], and I, R = 2-(3-benz[g]indolyl)ethyl [36806-70-9]. None of the compounds were as potent as indoramin [26844-12-2] in either test. I, R = 2-phenothiazin-10-ylethyl [52818-64-1] caused noncompetitive antagonism of histamine in an isolated guinea-pig ileum preparation Structure-activity relations were discussed.

Journal of Medicinal Chemistry published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C13H14N2O, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Barrett, Anthony G. M. published the artcileApplications of Crotonyldiisopinocampheylboranes in Synthesis: Total Synthesis of Restrictinol, Name: (+)-B-Methoxydiisopinocampheylborane, the publication is Journal of Organic Chemistry (1999), 64(1), 162-171, database is CAplus and MEDLINE.

The total synthesis of restrictinol, the hydrolysis product of the antifungal natural product restricticin, starting from com. available Me (S)-(+)-3-hydroxy-2-methylpropionate was achieved. Key steps in the strategy involved (1) the use of Brown’s allylboration chem. to construct an acyclic intermediate bearing three of the four stereogenic centers of the natural product, (2) formation of a C-glycosidic vinyl iodide, and (3) introduction of the triene side chain via a Suzuki coupling reaction.

Journal of Organic Chemistry published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Name: (+)-B-Methoxydiisopinocampheylborane.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Fang, Wei-Jie published the artcileDeletion of Ac-NMePhe¹ from [NMePhe¹]arodyn under acidic conditions, part 2: effects of substitutions on pharmacological activity, Application of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is Biopolymers (2011), 96(1), 103-110, database is CAplus and MEDLINE.

Arodyn (Ac[Phe^1,2,3,Arg⁴,D-Ala⁸]Dyn A(1-11)NH₂) is an acetylated dynorphin A (Dyn A) analog that is a potent and selective κ opioid receptor antagonist, and its analog [NMePhe¹]arodyn shows even higher affinity and selectivity for κ opioid receptors. However, the latter compound is prone to deletion of the Ac-NMePhe moiety from the N-terminus of the peptide during acidic cleavage as described in the accompanying paper. Several stable analogs of [NMePhe¹]arodyn and [NMePhe¹,Trp³]arodyn where the acetyl group was substituted with a heteroatom-containing group were evaluated for their opioid receptor affinity, selectivity, and efficacy. Methoxycarbonyl derivatives exhibited the highest κ opioid receptor affinity among the analogs. Addnl. [CH₃OCO-NMePhe¹]arodyn analogs where position 3 was substituted with other aromatic or nonaromatic residues were also evaluated for κ receptor affinity, selectivity, and efficacy. [CH₃OCO-NMePhe¹]arodyn has similar κ opioid receptor affinity as [NMePhe¹]arodyn, retains high κ opioid receptor selectivity, and is a potent κ opioid receptor antagonist.

Biopolymers published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Application of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Oikonomou, Adriana published the artcileDefence against Bremia lactucae conferred by the resistance gene Dm7 in lettuce is broken by treatment with dichloroisonicotinic acid, Name: 4-Hydroxy-3,5-dimethoxybenzaldehyde, the publication is Plant Pathology (2022), 71(3), 611-620, database is CAplus.

The effect of inducers of systemic acquired resistance, dichloroisonicotinic acid (DCINA) and acibenzolar-S-Me (BION), on compatible interactions between Bremia lactucae and lettuce were examined using a detached cotyledon infection assay. Treatment with both activators caused a reduction in sporulation on susceptible cultivars Cobham Green challenged with isolate CL9W and Diana inoculated with isolate Tv, with DCINA being more effective than BION on an equimolar basis. Unexpectedly, treatment with both compounds suppressed the resistance conferred by the Dm7 gene in cv. Diana challenged by isolate CL9W (A7). The frequency of sporulation was greatly increased by DCINA in the incompatible interaction. The suppression of defense was associated with a delay in the onset of the Dm7-based hypersensitive reaction as indicated by the extended viability of penetrated epidermal cells, and reductions in both the accumulation of the phytoalexin lettucenin A and the deposition of autofluorescent phenolics such as syringaldehyde on plant and oomycete cell walls. The anal. of DCINA homologues indicated that 2-chloroisonicotinic acid was as effective as the dichloro-derivative in suppressing resistance in cv. Diana, whereas the absence of the carboxyl group rendered 2,6-dichloropyridine inactive. Infection of cotyledons by Botrytis cinerea was also found to be enhanced by DCINA treatment. Based on our results, we discuss the possibility that DCINA reduces Dm7 transcription through an epigenetic mechanism, as is supported by bioinformatic analyses of the resistance gene, and that it suppresses jasmonate-dependent resistance to B. cinerea.

Plant Pathology published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C9H10O4, Name: 4-Hydroxy-3,5-dimethoxybenzaldehyde.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Hilimire, Thomas A. published the artcileN-Methylation as a Strategy for Enhancing the Affinity and Selectivity of RNA-binding Peptides: Application to the HIV-1 Frameshift-Stimulating RNA, Application of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is ACS Chemical Biology (2016), 11(1), 88-94, database is CAplus and MEDLINE.

Human Immunodeficiency Virus (HIV) type 1 uses a -1 programmed ribosomal frameshift (-1 PRF) event to translate its enzymes from the same transcript used to encode the virus’ structural proteins. The frequency of this event is highly regulated, and significant deviation from the normal 5-10% frequency has been demonstrated to decrease viral infectivity. Frameshifting is primarily regulated by the Frameshift Stimulatory Signal RNA (FSS-RNA), a thermodynamically stable, highly conserved stem loop that has been proposed as a therapeutic target. We describe the design, synthesis, and testing of a series of N-Me peptides able to bind the HIV-1 FSS RNA stem loop with low nanomolar affinity and high selectivity. Surface plasmon resonance (SPR) data indicates increased affinity is a reflection of a substantially enhanced on rate. Compounds readily penetrate cell membranes and inhibit HIV infectivity in a pseudotyped virus assay. Viral infectivity inhibition correlates with compound-dependent changes in the ratios of Gag and Gag-Pol in virus particles. As the first compounds with both single digit nanomolar affinities for the FSS RNA and an ability to inhibit HIV in cells, these studies support the use of N-methylation for enhancing the affinity, selectivity, and bioactivity of RNA-binding peptides.

ACS Chemical Biology published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Application of (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem