Heterocyclic Building Blocks-isoxazole

Isoxazoles. XVI. Reaction of nitrous acid and 5-amino-3,4-dialkylisoxazoles was written by Kano, Hideo;Adachi, Ikuo;Yamazaki, Eiko. And the article was included in Chemical & Pharmaceutical Bulletin in 1964.Reference of 14678-05-8 This article mentions the following:

5-Amino-3,4-dialkylisoxazoles (I) treated with HNO₂ gave 4-[(3,4-dialkylisoxazol-5-yl)azo]-2-isoxazolin-5-ones (II). Thus, an aqueous solution of 7 g. NaNO₂ added to 20 g. I [R = R¹ = Me, R² = H (III)] in 70 ml. 20% HCl at <5° and the precipitate washed (H₂O) and dried gave 78% II [R = R¹ = Me (IV)], m. 85° (dilute EtOH). Similarly, I (R = Me, R¹ = Et, R² = H) and I [R = Et, R¹ = Me, R² = H (V)] with HNO₂ gave liquid II [R = Me, R¹ = Et (VI)] and II [R = Et, R¹ = Me (VII)], m. 63.5°, resp. IV, VI, and VII warmed 5 min. on a water bath with 10% NH₄OH were hydrolyzed to 85% I [R = R¹ = Me, R² = MeC(:NOH)C(:N)Me (VIII)], m. 202° (EtOH), 62% I [R = Me, R¹ = Et, R² = MeC(:NOH)C(:N)Et (IX)],m. 203.5°, and 100% I [R = Et, R¹ = Me, R² = EtC(:NOH)C(:N)Me (X)], m. 149°, resp. VIII, IX, and X were further hydrolyzed by dissolving in 30-40% H₂SO₄ to I [R = R¹ = Me, R² = MeC(:O)(:N)Me, m. 113°, I [R = Me, R¹ = Et, R² = MeC(:O)C(:N)Et, m. 95-7° (ligroine), and I [R = Et, R¹ = Me, R² = EtC(:O)C(:N)Me], m. 102-4°, resp. III in 10% HCl coupled with the appropriate diazonium chloride afforded liquid XI [R = o-NO₂ (XII)], XI [R = m-NO₂ (XIII)], m. 72°, and XI [R = p-NO₂ (XIV)], m. 91°. XII, XIII, and XIV were hydrolyzed in alc. 10% NH₄OH to MeC(:NOH)Ac (XV) o-nitrophenylhydrazone, m. 221° (decomposition), XV m-nitrophenylhydrazone, m. 257°, and XV p-nitrophenylhydrazone, m. 251°, resp. These results showed that Hanriot’s structure (Bull. Soc. Chim. France [3],5 776(1891)) for the product obtained from diazotizing V was incorrect. In the experiment, the researchers used many compounds, for example, Isoxazol-5-amine (cas: 14678-05-8Reference of 14678-05-8).

Isoxazol-5-amine (cas: 14678-05-8) belongs to isoxazole derivatives. Isoxazoles are aromatic heterocycles containing an N–O bond. The weakness of this bond allows the ring opening of these heterocycles under reductive conditions. Isoxazole can be synthesised via a variety of methods. Examples include via a 1,3-dipolar cycloaddition of nitrile oxides with alkynes.Reference of 14678-05-8

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

From Hit Seeking to Magic Bullets: The Successful Union of Epigenetic and Fragment Based Drug Discovery (EPIDD + FBDD) was written by Vaidergorn, Miguel M.;da Silva Emery, Flavio;Ganesan, A.. And the article was included in Journal of Medicinal Chemistry in 2021.Name: (S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide This article mentions the following:

We review progress in the application of fragment-based drug discovery (FBDD) to epigenetic drug discovery (EPIDD) targeted at epigenetic writer and eraser enzymes as well as reader domains over the last 15 years. The greatest successes to date are in prospecting for bromodomain binding ligands. From a diverse array of fragment hits, multiple potent and selective compounds ensued, including the oncol. clin. candidates mivebresib, ABBV-744, pelabresib, and PLX51107. In the experiment, the researchers used many compounds, for example, (S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide (cas: 1380087-89-7Name: (S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide).

(S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide (cas: 1380087-89-7) belongs to isoxazole derivatives. Isoxazoles present in various natural products and synthetic compounds of biological importance like antibacterial, antagonists, antiinflammatory, analgesics, and also show the applications in functional materials. Some alternative routes for the synthesis of isoxazoles have also been developed and reported. The 2-benzoyl-2-halo-2H-azirines provide 4-haloisoxazoles in good yields after heating in toluene at reflux temperature.Name: (S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Nitrogen-15 NMR spectroscopy. Part X. Nitrogen-15 NMR spectra of azoles with two heteroatoms was written by Chen, Ban Chin;Von Philipsborn, Wolfgang;Nagarajan, Kuppuswamy. And the article was included in Helvetica Chimica Acta in 1983.Related Products of 5765-44-6 This article mentions the following:

The ¹⁵N-NMR spectra of azoles, with natural isotope abundance, have been measured under different exptl. conditions, and chem. shifts are reported for imidazoles, pyrazoles, oxazoles, isoxazoles, thiazoles, and isothiazoles. General trends of substituent effects in this heterocyclic series are discussed based on the data of 67 substituted azoles, dihydro- and tetrahydroazoles. ¹⁵N, ¹H spin-coupling constants have been determined from spectra obtained by [¹H] → ¹⁵N polarization-transfer experiments, i.e. an application of INEPT and DEPT pulse sequences. Two-bond and three-bond coupling constants are fully assigned and are discussed in terms of the specific pathways in azoles. The potential of structural applications of the new data is illustrated for isomeric nitro-imidazoles and highly-substituted pyrazoles, and in the case of ring-chain tautomerism of 2-substituted tetrahydrooxazoles. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Related Products of 5765-44-6).

5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives. Isoxazole rings are found in some natural products, such as ibotenic acid and muscimol. Isoxazole can be synthesised via a variety of methods. Examples include via the reaction of hydroxylamine with 1,3-diketones or derivatives of propiolic acid.Related Products of 5765-44-6

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Sitaxsentan sodium for pulmonary hypertension was written by MacIntyre, Iain M.;Dhaun, Neeraj;Goddard, Jane;Webb, David J.. And the article was included in Drugs of Today in 2008.Name: Sodium (4-chloro-3-methylisoxazol-5-yl)((2-(2-(6-methylbenzo[d][1,3]dioxol-5-yl)acetyl)thiophen-3-yl)sulfonyl)amide This article mentions the following:

Sitaxsentan is the first oral endothelin receptor antagonist (ETRA) with high selectivity for the endothelin-A (ET_A) receptor to be approved for clin. use by regulatory agencies in Europe for the treatment of pulmonary arterial hypertension (PAH). Clin. trials have shown it to be well tolerated and to improve exercise tolerance, functional class and pulmonary hemodynamics in PAH, results which appear to be at least as good as those for the mixed ETRA bosentan. Importantly, compared to bosentan, sitaxsentan has a lower incidence of liver toxicity and no interaction with sildenafil, a drug commonly used in the management of PAH. Furthermore, there is increasing evidence to suggest that ETRAs may play an important role in the future management of a wide variety of other conditions, from hypertension and renal disease to connective tissue disease and cancer. In some of these conditions, ET_A selectivity may be an advantage. In the experiment, the researchers used many compounds, for example, Sodium (4-chloro-3-methylisoxazol-5-yl)((2-(2-(6-methylbenzo[d][1,3]dioxol-5-yl)acetyl)thiophen-3-yl)sulfonyl)amide (cas: 210421-74-2Name: Sodium (4-chloro-3-methylisoxazol-5-yl)((2-(2-(6-methylbenzo[d][1,3]dioxol-5-yl)acetyl)thiophen-3-yl)sulfonyl)amide).

Sodium (4-chloro-3-methylisoxazol-5-yl)((2-(2-(6-methylbenzo[d][1,3]dioxol-5-yl)acetyl)thiophen-3-yl)sulfonyl)amide (cas: 210421-74-2) belongs to isoxazole derivatives. Isoxazoles present in various natural products and synthetic compounds of biological importance like antibacterial, antagonists, antiinflammatory, analgesics, and also show the applications in functional materials. The most common methods for N–O bond cleavage in isoxazoles are hydrogenation with palladium or platinum catalysts or with Raney Ni. Recent developments have shown that Mo(CO)6 efficiently cleaves the N–O bond in isoxazoles.Name: Sodium (4-chloro-3-methylisoxazol-5-yl)((2-(2-(6-methylbenzo[d][1,3]dioxol-5-yl)acetyl)thiophen-3-yl)sulfonyl)amide

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Design and synthesis of 3-(2-pyridyl)pyrazolo[1,5-a]pyrimidines as potent CRF₁ receptor antagonists was written by Huang, Charles Q.;Wilcoxen, Keith M.;Grigoriadis, Dimitri E.;McCarthy, James R.;Chen, Chen. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2004.Electric Literature of C4H5NO This article mentions the following:

A series of 3-(2-pyridyl)pyrazolo[1,5-a]pyrimidines I [R¹ = Cl, O₂N, Me, F₃C, H₂N, HO, etc.; R² = H, Me, Cl, O₂N, H₂N, MeO, NO, etc.; R³, R⁴ = n-Pr, n-Bu, MeOCH₂CH₂, cyclopropylmethyl, PhCH₂] was designed and synthesized as antagonists for the corticotropin-releasing factor-1 (CRF₁) receptor. Several compounds such as I [R¹ = Me₂N; R² = Me; R³ = R⁴ = n-Pr; (II)] (K_i = 10 nM) exhibited good binding affinities at the CRF₁ receptor. In addition, II had adequate solubility in water. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Electric Literature of C4H5NO).

5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives.Synthetically, isoxazoles serve as valuable precursors for the construction of diverse molecules, including many natural products. Isoxazoles are potent isosteres of pyridine and have been found to inhibit voltage-gated sodium channels for pain control, for the construction of tetracycline antibiotic derivatives, and as a therapeutic agent for depression.Electric Literature of C4H5NO

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Structure-Based Discovery of CF53 as a Potent and Orally Bioavailable Bromodomain and Extra-Terminal (BET) Bromodomain Inhibitor was written by Zhao, Yujun;Zhou, Bing;Bai, Longchuan;Liu, Liu;Yang, Chao-Yie;Meagher, Jennifer L.;Stuckey, Jeanne A.;McEachern, Donna;Przybranowski, Sally;Wang, Mi;Ran, Xu;Aguilar, Angelo;Hu, Yang;Kampf, Jeff W.;Li, Xiaoqin;Zhao, Ting;Li, Siwei;Wen, Bo;Sun, Duxin;Wang, Shaomeng. And the article was included in Journal of Medicinal Chemistry in 2018.COA of Formula: C20H16ClN3O2 This article mentions the following:

We report the structure-based discovery of CF53 (28) as a highly potent and orally active inhibitor of bromodomain and extra-terminal (BET) proteins. By the incorporation of a NH-pyrazole group into the 9H-pyrimido[4,5-b]indole core, we identified a series of compounds that bind to BRD4 BD1 protein with K_i values of <1 nM and achieve low nanomolar potencies in the cell growth inhibition of leukemia and breast cancer cells. The most-promising compound, CF53, possesses excellent oral pharmacokinetic properties and achieves significant antitumor activity in both triple-neg. breast cancer and acute leukemia xenograft models in mice. Determination of the co-crystal structure of CF53 with the BRD4 BD1 protein provides a structural basis for its high binding affinity to BET proteins. CF53 is very selective over non-BET bromodomain-containing proteins. These data establish CF53 as a potent, selective, and orally active BET inhibitor, which warrants further evaluation for advanced preclin. development. In the experiment, the researchers used many compounds, for example, (S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide (cas: 1380087-89-7COA of Formula: C20H16ClN3O2).

(S)-2-(6-(4-Chlorophenyl)-1-methyl-4H-benzo[c]isoxazolo[4,5-e]azepin-4-yl)acetamide (cas: 1380087-89-7) belongs to isoxazole derivatives. Isoxazoles are aromatic heterocycles containing an N–O bond. The weakness of this bond allows the ring opening of these heterocycles under reductive conditions. As with isoxazolines, isoxazoles may be cleaved using low-valent titanium obtained from the Kulinkovich reaction.This procedure affords enaminoketones from 2,4-substituted isoxazoles.COA of Formula: C20H16ClN3O2

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Synthesis of novel bicyclic 2-amino-4(1H)-pyridones. Reaction of lactim ethers with α-cyanoacetone dianion was written by Jiang, Jack B.;Urbanski, Maud J.. And the article was included in Tetrahedron Letters in 1985.Category: isoxazole This article mentions the following:

Lactim ethers I (X = S, bond; Z = O,S; n = 1-4), treated with C^–H₂COC^–HCN followed by MeOH, yielded bicyclic 2-amino-4(1H)-pyridones II. The dianion was generated in situ by treating 5-methylisoxazole with LiN(CHMe₂)₂. In the absence of MeOH ring closure did not occur. O-, N-, And C-alkylation of II was demonstrated. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Category: isoxazole).

5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives. Isoxazole are described as inhibitors of acetylcholinesterase (AChE). Isoxazole ligands bind to and inhibit the Sxc- antiporter. Isoxazoles are potent isosteres of pyridine and have been found to inhibit voltage-gated sodium channels for pain control, for the construction of tetracycline antibiotic derivatives, and as a therapeutic agent for depression.Category: isoxazole

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Direct nitration of five membered heterocycles was written by Katritzky, Alan R.;Scriven, Eric F. V.;Majumder, Suman;Akhmedova, Rena G.;Akhmedov, Novruz G.;Vakulenko, Anatoliy V.. And the article was included in ARKIVOC (Gainesville, FL, United States) in 2005.Product Details of 5765-44-6 This article mentions the following:

Direct nitration of a variety of furans, pyrroles, thiophenes, pyrazoles, imidazoles, isoxazoles and thiazoles (17 compounds) with nitric acid/trifluoroacetic anhydride affords mononitro derivatives in average yield of 60%. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Product Details of 5765-44-6).

5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives. Isoxazoles present in various natural products and synthetic compounds of biological importance like antibacterial, antagonists, antiinflammatory, analgesics, and also show the applications in functional materials. Fe(CO)5 efficiently cleaves the N–O bond of fused isoxazolo-1,4-quinones to give the corresponding imines.All the common reducing reagents failed to open the isoxazole ring.Product Details of 5765-44-6

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Identification of 1-(3-(6,7-Dimethoxyquinazolin-4-yloxy)phenyl)-3-(5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-yl)urea Hydrochloride (CEP-32496), a Highly Potent and Orally Efficacious Inhibitor of V-RAF Murine Sarcoma Viral Oncogene Homologue B1 (BRAF) V600E was written by Rowbottom, Martin W.;Faraoni, Raffaella;Chao, Qi;Campbell, Brian T.;Lai, Andiliy G.;Setti, Eduardo;Ezawa, Maiko;Sprankle, Kelly G.;Abraham, Sunny;Tran, Lan;Struss, Brian;Gibney, Michael;Armstrong, Robert C.;Gunawardane, Ruwanthi N.;Nepomuceno, Ronald R.;Valenta, Ianina;Hua, Helen;Gardner, Michael F.;Cramer, Merryl D.;Gitnick, Dana;Insko, Darren E.;Apuy, Julius L.;Jones-Bolin, Susan;Ghose, Arup K.;Herbertz, Torsten;Ator, Mark A.;Dorsey, Bruce D.;Ruggeri, Bruce;Williams, Michael;Bhagwat, Shripad;James, Joyce;Holladay, Mark W.. And the article was included in Journal of Medicinal Chemistry in 2012.COA of Formula: C4H3F3N2O This article mentions the following:

The Ras/RAF/MEK/ERK mitogen-activated protein kinase (MAPK) signaling pathway plays a central role in the regulation of cell growth, differentiation, and survival. Expression of mutant BRAF^V600E results in constitutive activation of the MAPK pathway, which can lead to uncontrolled cellular growth. Herein, we describe an SAR optimization campaign around a series of quinazoline derived BRAF^V600E inhibitors. In particular, the bioisosteric replacement of a metabolically sensitive tert-Bu group with fluorinated alkyl moieties is described. This effort led directly to the identification of a clin. candidate 1-(3-(6,7-dimethoxyquinazolin-4-yloxy)phenyl)-3-(5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-yl)urea hydrochloride (CEP-32496, I). CEP-32496 exhibits high potency against several BRAF^V600E-dependent cell lines and selective cytotoxicity for tumor cell lines expressing mutant BRAF^V600E vs. those containing wild-type BRAF. It also exhibits an excellent PK profile across multiple preclin. species. In addition, significant oral efficacy was observed in a 14-day BRAF^V600E-dependent human Colo-205 tumor xenograft mouse model, upon dosing at 30 and 100 mg/kg BID. In the experiment, the researchers used many compounds, for example, 3-(Trifluoromethyl)isoxazol-5-amine (cas: 108655-63-6COA of Formula: C4H3F3N2O).

3-(Trifluoromethyl)isoxazol-5-amine (cas: 108655-63-6) belongs to isoxazole derivatives. Isoxazole are described as inhibitors of acetylcholinesterase (AChE). Isoxazole ligands bind to and inhibit the Sxc- antiporter. The most common methods for N–O bond cleavage in isoxazoles are hydrogenation with palladium or platinum catalysts or with Raney Ni. Recent developments have shown that Mo(CO)6 efficiently cleaves the N–O bond in isoxazoles.COA of Formula: C4H3F3N2O

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Synthesis of isoxazolium salts unsubstituted in the 3-position was written by Wilson, B. D.;Burness, D. M.. And the article was included in Journal of Organic Chemistry in 1966.Recommanded Product: 5765-44-6 This article mentions the following:

A variety of isoxazoles unsubstituted in the 3-position were prepared and alkylated to form highly reactive isoxazolium salts, which are potentially useful as peptide bond-forming reagents. A few are inner salts related to Woodward’s reagent K. The explosive nature of isoxazolium perchlorates is revealed. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Recommanded Product: 5765-44-6).

5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives. Isoxazole are described as inhibitors of acetylcholinesterase (AChE). Isoxazole ligands bind to and inhibit the Sxc- antiporter. The most common methods for N–O bond cleavage in isoxazoles are hydrogenation with palladium or platinum catalysts or with Raney Ni. Recent developments have shown that Mo(CO)6 efficiently cleaves the N–O bond in isoxazoles.Recommanded Product: 5765-44-6

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem