Heterocyclic Building Blocks-isoxazole

Zhang, Zhaofei published the artcileSemi-heterogeneous photo-Cu-dual-catalytic cross-coupling reactions using polymeric carbon nitrides, Product Details of C18H12FN, the publication is Science Bulletin (2022), 67(1), 71-78, database is CAplus.

A merger of copper catalysis and semiconductor photocatalysis using polymeric carbon nitride (PCN) for multi-type cross-coupling reactions was developed. This dual catalytic system enables mild C-H arylation, chalcogenation, and C-N cross-coupling reactions under visible light irradiation with a broad substrate scope. Good to excellent yields were obtained with appreciable site selectivity and functional group tolerance. Metal-free and low-cost PCN photocatalyst can easily be recovered and reused several times.

Science Bulletin published new progress about 57103-14-7. 57103-14-7 belongs to isoxazole, auxiliary class Fused Tricycles,Carbazoles, name is 9-(4-Fluorophenyl)-9H-carbazole, and the molecular formula is C14H10N2O, Product Details of C18H12FN.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Zhu, Yi-Ming published the artcilePalladium Catalyzed Insertion Reaction of Isocyanides with 3-Arylisoxazol-5(4H)-ones: Synthesis of 4-Aminomethylidene Isoxazolone Derivates, COA of Formula: C9H7NO2, the publication is Journal of Organic Chemistry (2019), 84(17), 11007-11013, database is CAplus and MEDLINE.

A palladium catalyzed insert reaction of isocyanides to 3-arylisoxazol-5(4H)-ones for the construction of 4-aminomethylidene isoxazolone derivatives is reported. In this transformation, only the C-H bond of the methylene group was involved while the remaining ring structure was retained. In general, this work provided a new protocol for the synthesis of 4-aminomethylidene isoxazolones.

Journal of Organic Chemistry published new progress about 1076-59-1. 1076-59-1 belongs to isoxazole, auxiliary class Oxazoline,Benzene,Ester, name is 3-Phenylisoxazol-5(2H)-one, and the molecular formula is C38H74Cl2N2O4, COA of Formula: C9H7NO2.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Mallick, Shubhadip published the artcileSilyldefluorination of Fluoroarenes by Concerted Nucleophilic Aromatic Substitution, Product Details of C18H12FN, the publication is Angewandte Chemie, International Edition (2019), 58(1), 283-287, database is CAplus and MEDLINE.

The reaction of readily generated silyl Li reagents with various aryl fluorides to provide the corresponding aryl silanes is reported. DFT calculations reveal that the nucleophilic aromatic substitution of the fluoride anion by the silyl Li reagent proceeds through concerted ipso substitution. In contrast to the classical nucleophilic aromatic substitution, this concerted ionic silyldefluorination also occurs on more electron-rich aryl fluorides.

Angewandte Chemie, International Edition published new progress about 57103-14-7. 57103-14-7 belongs to isoxazole, auxiliary class Fused Tricycles,Carbazoles, name is 9-(4-Fluorophenyl)-9H-carbazole, and the molecular formula is C18H12FN, Product Details of C18H12FN.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Feng, Bin-Bin published the artcileA Convenient Synthesis of Spiro[isoxazole-pyrazoloquinoline] Derivatives under Catalyst-Free Conditions, Product Details of C9H7NO2, the publication is Synthesis (2016), 48(1), 65-72, database is CAplus.

The same three-component reaction of aromatic aldehyde, 1H-indazol-6-amine and 3-phenylisoxazol-5(4H)-one in refluxing ethanol under catalyst-free conditions gave two entirely different kinds of products depending on the substituents on the benzene ring. The reaction selectively gave 5H-spiro[isoxazole-4,8′-pyrazolo[3,4-f]quinolin]-5-ones with strong electron-withdrawing groups on the aromatic aldehyde, while it resulted in ring-opened pyrazoloquinoline derivatives with other substituents. The former structure was confirmed by x-ray diffraction anal.

Synthesis published new progress about 1076-59-1. 1076-59-1 belongs to isoxazole, auxiliary class Oxazoline,Benzene,Ester, name is 3-Phenylisoxazol-5(2H)-one, and the molecular formula is C9H7NO2, Product Details of C9H7NO2.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Liu, Haidong published the artcileα-Iminyl Cation-Involved Indole Construction via Bronsted Acid Promoted Reaction of Isoxazol-5-ones, Application of 3-Phenylisoxazol-5(2H)-one, the publication is Journal of Organic Chemistry (2022), 87(16), 11226-11230, database is CAplus and MEDLINE.

Herein, a strategically novel method for the efficient construction of indole skeletons I (R¹ = Ph, furan-2-yl, cyclohexyl, etc.; R² = H, Me, C(O)OH; R¹R² = -((CH₂)₄)-; R³ = 5-Me, 7-Cl, 4-Br, etc.) using 2-phenylisoxazol-5-ones as the starting material was reported. This reaction proceeds via Bronsted acid promoted α-iminyl cation generation by N-O bond cleavage and a subsequent intramol. cyclization to obtain 1H-indole-3-carboxylic acids, which further undergoes decarboxylation to afford the final product. Control experiments show that the N-O bond cleavage and intramol. cyclization proceeds so fast that the 1H-indole-3-carboxylic acids, could be isolated in high yields even after 5-10 min. The substrate scope of this transformation is broad and the desired products are obtained in moderate to good yields. The transition-metal-free reaction condition, CO₂ as the sole byproduct, and good practicability adds synthetic potential of this transformation in pharmaceuticals and flavors industry.

Journal of Organic Chemistry published new progress about 1076-59-1. 1076-59-1 belongs to isoxazole, auxiliary class Oxazoline,Benzene,Ester, name is 3-Phenylisoxazol-5(2H)-one, and the molecular formula is C9H7NO2, Application of 3-Phenylisoxazol-5(2H)-one.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Yang, Shuyi published the artcileParecoxib shortens the duration of acute postoperative pain after laparoscopic-assisted vaginal hysterectomy, Recommanded Product: Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, the publication is Frontiers in Pharmacology (2019), 689, database is CAplus and MEDLINE.

The effect of parecoxib sodium on the duration and severity of acute postoperative pain after laparoscopic-assisted vaginal hysterectomy has been inadequately studied. This randomized, controlled trial compared the effects of parecoxib, methylprednisolone, and placebo on the duration of acute postoperative pain after elective laparoscopicassisted vaginal hysterectomy. Ninety-four eligible patients were randomized to three groups [parecoxib sodium 40 mg (Group P), methylprednisolone 1 mg/kg (Group M), and saline (Group S)]. The duration of pain during coughing [median (interquartile range)] was significantly lower in Group P than in Group M or Group S [26.0 (5.8-48.0) vs. 48.0 (30.0-55.5) vs. 48.0 (36.0-58.5) h; p = 0.025]. The duration of pain during rest was also significantly lower in Group P than in Group M or Group S [5.5 (3.8-21.0) vs. 24.0 (6.0- 28.0) vs. 22.0 (5.8-36.0) h; p = 0.009]. Compared with those in Group M and Group S, the patients in Group P reported less intense visceral pain during coughing at 12 ( p = 0.050) and 24 h ( p = 0.009) as well as at rest at 12 h ( p = 0.008). Compared with those in Group P and Group S, the patients in Group M showed lower serum C-reactive protein levels and higher blood glucose levels after surgery. No differences were noted in nausea, vomiting, length of hospital stay, wound infection, and delayed wound healing among the groups. Thus, parecoxib sodium reduces the duration and intensity of acute postoperative pain after laparoscopic-assisted vaginal hysterectomy.

Frontiers in Pharmacology published new progress about 198470-85-8. 198470-85-8 belongs to isoxazole, auxiliary class Immunology/Inflammation,COX, name is Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, and the molecular formula is C12H16N2O2, Recommanded Product: Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Bi, Yan published the artcileAnalysis of influence of parecoxib sodium on recovery period after laparoscopic cholecystectomy under fast track anesthesia with remifentanil later, HPLC of Formula: 198470-85-8, the publication is Yixue Zongshu (2015), 21(10), 1890-1892, database is CAplus.

Objective To observe the influence of parecoxib sodium on the recovery period after laparoscopic cholecystectomy (LC) under fast track anesthesia with remifentanil. Methods A total of 114 cases of gallstone admitted in Shaoguan First People’s Hospital from Mar. 2013 to Feb. 2014 were divided into the control group (56 cases) and observation group (58 cases) by random number table method. Patients in both groups received LC treatment under fast track anesthesia with remifentanil, patients in the observation group received injection of 5 mL saline and parecoxib sodium mixture 20 min before anesthesia, while patients in the control group received injection of 5 mL saline. The awake and extubation time of the two groups was recorded, while changes of mean pulsating pressure (MAP), pulse oxygen saturation (SpO₂), heart rate and other indicators of recovery period were observed at the time points of 5 min before extubation (T₁), extubation time (T₂), 5 min after extubation (T₃) and 15 min after extubation (T₄), besides, Ramsay sedation and VAS pain scores were recorded, incidences of restlessness, arrhythmia and other adverse reactions were observed Results MAP, heart rate of the observation group only fluctuated at T₂, then leveled off; MAP, heart rate of the control group significantly fluctuated after T1, there was statistically significant difference between the two groups (P<0.05). Postoperative agitation score and VAS pain score of the observation group were (1.8±0.9) scores and (2.3±1.2) scores, significantly lower than those of the control group (3.4±1.0) scores and (4.2±1.3) scores], while Ramsay sedation score was higher than the control group [(3.5±1.1) scores vs (1.7±0.8) scores], the difference was statistically significant (P<0.01). The incidence of agitation of the observation group was lower than the control group [10.3% (6/58) vs 30.4% (17/56)], the difference was statistically significant (P<0.01). Conclusion Application of parecoxib sodium to induce the fast track anesthesia with remifentanil before LC can stable the hemodynamics, reduce postoperative pain and stress response, with fewer adverse reactions, therefore, it is worth for clin. promotion.

Yixue Zongshu published new progress about 198470-85-8. 198470-85-8 belongs to isoxazole, auxiliary class Immunology/Inflammation,COX, name is Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, and the molecular formula is C19H17N2NaO4S, HPLC of Formula: 198470-85-8.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Qin, Zijian published the artcileClassification of Cyclooxygenase-2 Inhibitors Using Support Vector Machine and Random Forest Methods, Synthetic Route of 198470-85-8, the publication is Journal of Chemical Information and Modeling (2019), 59(5), 1988-2008, database is CAplus and MEDLINE.

This work reports the classification study conducted on the biggest COX-2 inhibitor data set so far. Using 2925 diverse COX-2 inhibitors collected from 168 pieces of literature, we applied machine learning methods, support vector machine (SVM) and random forest (RF), to develop 12 classification models. The best SVM and RF models resulted in MCC values of 0.73 and 0.72, resp. The 2925 COX-2 inhibitors were reduced to a data set of 1630 mols. by removing intermediately active inhibitors, and 12 new classification models were constructed, yielding MCC values above 0.72. The best MCC value of the external test set was predicted to be 0.68 by the RF model using ECFP_4 fingerprints. Moreover, the 2925 COX-2 inhibitors were clustered into eight subsets, and the structural features of each subset were investigated. We identified substructures important for activity including halogen, carboxyl, sulfonamide, and methanesulfonyl groups, as well as the aromatic nitrogen atoms. The models developed in this study could serve as useful tools for compound screening prior to laboratory tests.

Journal of Chemical Information and Modeling published new progress about 198470-85-8. 198470-85-8 belongs to isoxazole, auxiliary class Immunology/Inflammation,COX, name is Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, and the molecular formula is C19H17N2NaO4S, Synthetic Route of 198470-85-8.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Niu, Qingqing published the artcileIsatins 3-C annulation vs ring-opening: Two different pathways for synthesis of spiro compounds via multicomponent reactions, Application In Synthesis of 1076-59-1, the publication is Tetrahedron Letters (2019), 60(43), 151181, database is CAplus.

An efficient synthesis of spiro compounds I (R¹ = 5-CH₃, 7-Br, 6-Cl, etc.; R² = H, Me; R³ = H, Ph), II [R³ = 7-CF₃, 5,7-(Me)₂, 7-I, etc.; R⁴ = H, Me], III and IV (R³ = H) via two different pathways from the reactions of isatins, 3-phenylisoxazol-5(4H)-one, (3-ethylisoxazol-5(4H)-one) and pyrazol-5-amine, (6-aminopyrimidine-2,4(1H,3H)-dione) was reported. The catalyst Amberlyst-15 could be easy recycled and reused for many time without any appreciable loss in catalytic activity. The new type spiro compounds were gained through the ring-opening of isatins process. The structures of spiro[indoline-3,4′-isoxazolo[5,4-b]pyrazolo[4,3-e]pyridin]-2-one, spiro[isoxazolo[5,4-b]quinoline-4,5′-pyrrolo[2,3-d]pyrimidine]-2′,4′,6′(1’H,3’H,7’H)-trione and spiro[indoline-3,4′-pyrazolo[3,4-b]pyridine]-2,6′(5’H)-dione were successfully confirmed by ¹H NMR, ¹³C NMR, HRMS, and X-ray crystal diffraction anal.

Tetrahedron Letters published new progress about 1076-59-1. 1076-59-1 belongs to isoxazole, auxiliary class Oxazoline,Benzene,Ester, name is 3-Phenylisoxazol-5(2H)-one, and the molecular formula is C9H7NO2, Application In Synthesis of 1076-59-1.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Wang, Liang published the artcileRhodium-catalyzed olefination of aryl tetrazoles via direct C-H bond activation, Formula: C8H5F3N4, the publication is Organic & Biomolecular Chemistry (2014), 12(40), 7923-7926, database is CAplus and MEDLINE.

Rh(III)-catalyzed direct olefination reaction via aromatic C-H bond activation is described using tetrazole as the directing group. This reaction provides a straightforward way for the synthesis of ortho-alkenyl aryl tetrazoles. Various functional groups tolerate the reaction conditions and afford the corresponding products in moderate to excellent yields.

Organic & Biomolecular Chemistry published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is 0, Formula: C8H5F3N4.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem