Category: isoxazole

The cyclodimerization of 3-methyl-2-butenenitrile was written by Tucker, H.;Golding, G.;Purvis, S. R.. And the article was included in Tetrahedron Letters in 1981.Application of 5765-44-6 This article mentions the following:

Treatment of RCMe:CHCN (R = Me, Et) with Li(NHCHMe₂)₂ between -78° and 0° (MeOCH₂CH₂OMe) gave the cyclic dimers I. The mechanism of this dimerization is discussed in terms of an allylic anion intermediate. On this basis, the product for the base-catalyzed dimerization of CH₂:CMeCH₂CN, previously reported to be II (Takabe, K.; et al., 1980) was reassigned as I. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Application of 5765-44-6).

5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives. Isoxazoles are aromatic heterocycles containing an N–O bond. Isoxazoles are commonly used as enaminoketone or β-diketone surrogate. The electrophilic cyclization of various 2-alkynone O-methyl oximes with a wide range of substrates such as ICl, I2, Br2, PhSeBr, etc. provides a variety of 3,4,5-trisubstituted isoxazoles in good to excellent yields.Application of 5765-44-6

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

An overview of the preclinical toxicity and potential carcinogenicity of sitaxentan (Thelin), a potent endothelin receptor antagonist developed for pulmonary arterial hypertension was written by Owen, Keith;Cross, David M.;Derzi, Mazin;Horsley, Elizabeth;Stavros, Fiona L.. And the article was included in Regulatory Toxicology and Pharmacology in 2012.Related Products of 210421-74-2 This article mentions the following:

Sitaxentan (Thelin), an endothelin receptor antagonist with a long duration of action and high specificity for the endothelin receptor A subtype, was used to treat pulmonary arterial hypertension. It was withdrawn from the market due to an idiosyncratic risk of drug-induced liver injury identified from emerging clin. trial data and clin. case reports. The preclin. safety profile of sitaxentan is presented, including single- and repeat-dose toxicity in mice, rats, and dogs and carcinogenicity in mice and rats. Sitaxentan-related adverse effects included coagulopathy in rats and dogs, increased serum alk. phosphatase activity in mice and dogs, and hepatic hypertrophy in all species. Decreased albumin, erythrocyte count, Hb concentration and hematocrit, and increased coagulation times and liver weight were also noted. These effects generally occurred at systemic exposures (AUC_0-24) that were substantially greater than those seen in humans. Twice-daily (vs. once daily) dosing resulted in increased toxicity, which correlated with increased trough plasma sitaxentan concentrations Sitaxentan appeared to have a low potential for testicular and hepatic toxicity and was not carcinogenic. These studies suggested that sitaxentan would have a reasonable margin of safety when used as directed in humans and supported a pos. benefit:risk assessment at the time of marketing approval. 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: 210421-74-2Related Products of 210421-74-2).

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 are aromatic heterocycles containing an N–O bond. Isoxazoles are commonly used as enaminoketone or β-diketone surrogate. 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.Related Products of 210421-74-2

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Mechanism of base catalyzed isomerization of 3-unsubstituted isoxazoles was written by Bertini, V.;De Munno, A.;Pino, P.. And the article was included in Chimica e l’Industria (Milan, Italy) in 1966.Recommanded Product: 5-Methylisoxazole This article mentions the following:

Kinetic data of isomerization in alk. solution at 25° are given for derivatives of I where R and R¹ are H, Cl, Br and Me. Similarly data for II is given where R is Cl, Br, I, H, or Me. Two possible transition states are postulated. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Recommanded Product: 5-Methylisoxazole).

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. 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: 5-Methylisoxazole

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Population pharmacokinetic analysis of risperidone and its metabolite and evaluation of effect of covariates on Pk parameters was written by Bootam, Sharath Babu;Kannadhasan, R.;Gummadi, Sridhar Babu. And the article was included in Natural Volatiles & Essential Oils in 2021.Electric Literature of C23H27FN4O3 This article mentions the following:

To characterize pharmacokinetic (PK) variability of risperidone and 9-OH risperidone using sparse sampling and to evaluate the effect of covariates on PK parameters. PK anal. used plasma samples collected from the Clin. Anti-psychotic Trials of Intervention Effectiveness. A nonlinear mixed-effects model was developed using NONMEM to describe simultaneously the risperidone and 9-OH risperidone concentration-time profile. Covariate effects on risperidone and 9-OH risperidone PK parameters were assessed, including age, weight, sex, smoking status, race and concomitant medications. PK samples comprised risperidone and 9-OH risperidone concentrations from 20 subjects that were available for anal. Ages ranged from 18 to 93 years. Population PK sub models for both risperidone and 9-OH risperidone with first-order absorption were selected to describe the concentration-time profile of risperidone and 9-OH risperidone. A mixture model was incorporated with risperidone clearance (CL) sep. estimated for three subpopulations [poor metabolizer (PM), extensive metabolizer (EM) and intermediate metabolizer (IM)]. Age significantly affected 9-OH risperidone clearance. Population parameter estimates for CL in PM, IM and EM were 12.9, 36 and 65.4 l h-1 and parameter estimates for risperidone half-life in PM, IM and EM were 25, 8.5 and 4.7 h, resp. A one-compartment mixture model with first-order absorption adequately described the risperidone and 9-OH risperidone concentrations Age was identified as a significant covariate on 9-OH risperidone clearance in this study. In the experiment, the researchers used many compounds, for example, 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (cas: 144598-75-4Electric Literature of C23H27FN4O3).

3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (cas: 144598-75-4) belongs to isoxazole derivatives. Isoxazoles are aromatic heterocycles containing an N–O bond. Isoxazoles are commonly used as enaminoketone or β-diketone surrogate. 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.Electric Literature of C23H27FN4O3

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Ozonolysis of substituted isoxazoles was written by Kashima, Choji;Takahashi, Katsumi;Hosomi, Akira. And the article was included in Heterocycles in 1994.Synthetic Route of C4H5NO This article mentions the following:

The ozonolysis of substituted isoxazoles, e.g. I, was investigated. The ozonolysis rates and the products were dependent on the site of the substituent group on isoxazole ring. The reaction mechanism of the ozonolysis of isoxazoles was also proposed. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Synthetic Route 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. 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.Synthetic Route of C4H5NO

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Acetylenic compounds, XLIV. Synthesis of 3-aminoisoxazoles and 3-hydroxyisoxazoles (3-isoxazolones) was written by Iwai, Issei;Nakamura, Norio. And the article was included in Chemical & Pharmaceutical Bulletin in 1966.Recommanded Product: 14678-05-8 This article mentions the following:

A solution of β,4-dibromocinnamonitrile (0.0028 mole) in 10 ml. EtOH was mixed with NH2OH.HCl (0.016 mole) in 10 ml. 10% NaOH. After standing overnight, the mixture was extracted with ether. The ethereal layer was extracted with 10% HCl solution After neutralization with aqueous NaOH, yellow precipitate was taken up in ether. After evaporation of the solvent, the residue was crystallized from aqueous MeOH to yield 57% yellow 3-amino-5-(p-bromophenyl)isoxazole (I), m. 147-9°. To a solution of 12.2 g. ClCN in 150 ml. absolute ether was added a solution of Grignard reagent prepared from p-methoxyphenylpropiolonitrile (II), m. 78.5-80°. To a mixture of 0.018 mole NH2OH.HCl and 0.062 mole 10% NaOH was added a solution of 0.006 mole (II) in 25 ml. EtOH. After standing overnight the mixture was extracted with ether to give 41% 3-amino-5-(p-methoxyphenyl)isoxazole (III), m. 171-2°. Similarly prepared was 3-methyl-5-aminoisoxazole (IV) m. 84-5°, 3:1 mixture of 3-amino-5-phenylisoxazole and IV, 3-sulfanilamido-5-methylisoxazole, m. 166-7°, 5-aminoisoxazole, m. 75-7°, 5-benzamidoisoxazole, m. 134-5° (62% yield), 3 aminoisoxazole, b. 75-6°, 3-benzamidoisoxazole, m. 148-9°, 3-acetylsulfanilamidoisoxazole, m. 245-7° (decomposition), 3-sulfanilamidoisoxazole, m. 124-6°, 3-hydroxy-5-phenylisoxazole, m. 163-5°, 3-hydroxy-5-(p-nitrophenyl)isoxazole, m. 232-4° (decomposition), 3-hydroxy-5-(p-chlorophenyl)isoxazole, m. 220-1° (decomposition), 3-hydroxy-5-(p-methoxyphenyl)isoxazole, m. 212-14° (decomposition), 3-hydroxy-5-methylisoxazole, m. 84-5°, 3-hydroxyisoxazole, m. 98-9°, 3-phenyl-5-isoxazolone, m. 151-2°. In the experiment, the researchers used many compounds, for example, Isoxazol-5-amine (cas: 14678-05-8Recommanded Product: 14678-05-8).

Isoxazol-5-amine (cas: 14678-05-8) 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.Recommanded Product: 14678-05-8

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Development of antiinflammatory agents. I. Isoxazole derivatives was written by Park, No Sang;Kim, Hyun Sook;Min, Changhee;Choi, Joong Kwon. And the article was included in Yakhak Hoechi in 1990.Application In Synthesis of 3-(Trifluoromethyl)isoxazol-5-amine This article mentions the following:

3-Substituted 5-aminoisoxazole-4-carboxylates I (R = CF₃, CHF₂, Ph, 4-MeOC₆H₄, 2-, 3-, or 4-R¹C₆H₄; R¹ = F, Cl, CF₃, NO₂; R² = Me) were prepared by the reaction of corresponding bromoaldoximes with cyanoacetate. I (R = CF₃, R² = Me) (II) was acylated with various aminopyridine derivatives to afford diamides. The ester group of II was hydrolyzed and decarboxylated easily to give 3-trifluoromethyl-5-aminoisoxazole. The aminoisooxazole was also converted to amides. The synthesized compounds were tested for antiinflammatory activities. In the experiment, the researchers used many compounds, for example, 3-(Trifluoromethyl)isoxazol-5-amine (cas: 108655-63-6Application In Synthesis of 3-(Trifluoromethyl)isoxazol-5-amine).

3-(Trifluoromethyl)isoxazol-5-amine (cas: 108655-63-6) 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. The electrophilic cyclization of various 2-alkynone O-methyl oximes with a wide range of substrates such as ICl, I2, Br2, PhSeBr, etc. provides a variety of 3,4,5-trisubstituted isoxazoles in good to excellent yields.Application In Synthesis of 3-(Trifluoromethyl)isoxazol-5-amine

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Preparation of β-oxo nitriles through acylation of trimethylsilyl cyanoacetate by mixed anhydrides was written by Goasdoue, Claude;Couffignal, Rene. And the article was included in Tetrahedron Letters in 1979.SDS of cas: 5765-44-6 This article mentions the following:

Treating Me₃SiO₂CCHLiCN (I) and EtCHLiCN with RCO₂CO₂Et (R = Pr, Ph) gave 59 and 74% RCOCH₂CN, and 55 and 74% RCOCHEtCN, resp. I was prepared by treating HO₂CCH₂CN with Me₃SiCl (90%) followed by lithiation. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6SDS of cas: 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. 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.SDS of cas: 5765-44-6

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Paliperidone Extended Release Versus Olanzapine in Treatment-Resistant Schizophrenia: A Randomized, Double-Blind, Multicenter Study was written by Wang, Dandan;Wei, Ning;Hu, Fangzhen;Li, Jianhua;Wang, Yucheng;Qian, Zhiwei;Yang, Miao;Yao, Mingrong;Xia, Yong;Yu, Hong;Tu, Wenzhen;Ye, Minjie;Qian, Cheng;Hu, Jianbo;Chen, Jingkai;Hu, Chanchan;Huang, Manli;Xu, Yi;Hu, Shaohua. And the article was included in Journal of Clinical Psychopharmacology in 2022.Application In Synthesis of 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one This article mentions the following:

Paliperidone is an atypical antipsychotic as effective as other atypical antipsychotics for schizophrenia. However, few studies have explored the efficacy of paliperidone for treatment-resistant schizophrenia. This study aimed to compare the efficacy and safety of paliperidone extended release (ER) vs. olanzapine in schizophrenia patients with either poor treatment response or intolerable adverse effects due to standardized antipsychotic therapy. This 12-wk randomized, double-blind, multicenter study compared the treatment efficacy on psychotic symptoms, cognitive functions, and tolerance between paliperidone ER (6-15 mg/d, n = 45) and olanzapine (10-30 mg/d, n = 41) in treatment-resistant or treatment-intolerant patients with schizophrenia. The severity of psychotic symptoms was evaluated by the Pos. and Neg. Syndrome Scale and the Clin. Global Impression Severity of Illness Scale. The cognitive functions were assessed by the MATRICS Consensus Cognitive Battery. In addition, the metabolic impacts were evaluated by weight gain and waist circumference. Patients with either paliperidone ER or olanzapine treatment showed apparent improvement in psychotic symptoms, without significant intergroup difference. Twelve-week paliperidone ER or olanzapine treatment did not improve the cognitive functions. Both paliperidone ER and olanzapine treatment caused significant increase in weight and waist circumference, and olanzapine had a greater impact on waist circumference than paliperidone ER. In addition, both drugs were well tolerated. Paliperidone ER could be a safe alternative for treatment-resistant schizophrenia. In the experiment, the researchers used many compounds, for example, 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (cas: 144598-75-4Application In Synthesis of 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one).

3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (cas: 144598-75-4) belongs to isoxazole derivatives. Isoxazoles are aromatic heterocycles containing an N–O bond. Isoxazoles are commonly used as enaminoketone or β-diketone surrogate. 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.Application In Synthesis of 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem

Relationship between CYP2D6 genotype, activity score and phenotype in a pediatric Thai population treated with risperidone was written by Hongkaew, Yaowaluck;Gaedigk, Andrea;Wilffert, Bob;Ngamsamut, Nattawat;Kittitharaphan, Wiranpat;Limsila, Penkhae;Sukasem, Chonlaphat. And the article was included in Scientific Reports in 2021.Formula: C23H27FN4O3 This article mentions the following:

Recently, the Clin. Pharmacogenetics Implementation Consortium (CPIC) have revised recommendations for the translation of CYP2D6 genotype to phenotype. Changes affect phenotype grouping, as well as the value used to calculate activity score for the CYP2D6*10 allele to better reflect the substantially decreased activity of this allele which is the most frequent allele found in Asian populations. This study aimed to evaluate whether the lower value for CYP2D6*10 as recommended, and the revised phenotype groupings improve the relationship between CYP2D6 genotype and risperidone measures. One hundred and ninety-nine children and adolescents with autism treated with a risperidone-based regimen for at least four weeks were included. CYP2D6 genotype was determined using the Luminex xTAG CYP2D6 Kit assay and translated into phenotype using different translation methods. Plasma concentrations of risperidone and 9-hydroxyrisperidone were measured using LC/MS/MS. Plasma levels of risperidone, risperidone concentration/dose ratio, and risperidone/9-hydroxyrisperidone ratio in patients with an activity score < 1 were significantly higher than those ≥ 1 (P value < 0.001 for all three parameters). Plasma risperidone levels and risperidone concentration/dose ratios were significantly higher in intermediate metabolizers (defined as AS = 0.25-0.75) than normal metabolizer (defined as AS = 1-2) patients (1.44 vs. 0.23 ng/mL, P < 0.001 and 1.63 vs. 0.29 ng/mL/ng, P < 0.001, resp.) as well as risperidone/9-hydroxyrisperidone ratio (0.20 vs. 0.04, P < 0.001). This is the first study in an Asian population utilizing the revised CPIC-recommended method for translating the CYP2D6 genotype to phenotype. In addition to validating that CYP2D6 genetic variation significantly impacts risperidone metabolism, we demonstrated that revised value for the CYP2D6*10 was superior for genotype to phenotype translation. However, at least for risperidone, subjects with an activity score of 1 presented as phenotypic normal, and not intermediate metabolizers, suggesting that phenotype classification is substrate dependent. In the experiment, the researchers used many compounds, for example, 3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (cas: 144598-75-4Formula: C23H27FN4O3).

3-(2-(4-(6-Fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one (cas: 144598-75-4) 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.Formula: C23H27FN4O3

Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem