Day: November 24, 2022

Joshi, Sameer M. published the artcileThe microwave-assisted synthesis of 5-substituted 1H-tetrazoles via [3+2] cycloaddition over a heterogeneous Cu-based catalyst: application to the preparation of ¹³N-labelled tetrazoles, Safety of 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, the publication is New Journal of Chemistry (2017), 41(16), 8084-8091, database is CAplus.

The [3+2] cycloaddition between various nitriles and sodium azide proceeded smoothly in the presence of a new Cu^II catalyst in N-methyl-2-pyrrolidone (NMP) to give the corresponding 5-substituted 1H-tetrazoles. The desired tetrazoles were obtained in high yields within 3-30 min by employing controlled microwave heating. The reaction most probably proceeded through the activation of the nitrile groups by the Cu^II species, followed by a successive [3+2] cycloaddition with the sodium azide. The good performance of the catalyst enabled the preparation of selected tetrazoles labeled with the positron emitter nitrogen-13 even under conventional heating. The short reaction time, simple work-up procedure, and recyclability of the catalyst were advantages of the method reported here.

New Journal of 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 C8H5F3N4, Safety of 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole.

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

Sridhar, Madabhushi published the artcileOne-step synthesis of 5-substituted 1H-tetrazoles from an aldehyde by reaction with acetohydroxamic acid and sodium azide under Bi(OTf)₃ catalysis, COA of Formula: C8H5F3N4, the publication is Synthesis (2013), 45(4), 507-510, database is CAplus.

An efficient one-step method for the synthesis of 5-substituted 1H-tetrazoles from aldehydes by reaction with acetohydroxamic acid and sodium azide using bismuth(III) triflate as the catalyst is described.

Synthesis 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 C10H7NO3, COA of Formula: C8H5F3N4.

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

Lin, Jin-bing published the artcileEffect of parecoxib sodium on intravenous analgesic effect of dezocine after cesarean section, Computed Properties of 198470-85-8, the publication is Guangdong Yixue (2017), 38(7), 1098-1100, database is CAplus.

Objective: To observe the effect of parecoxib sodium on the analgesic effect of dezocine after cesarean section and its adverse reactions. Methods: 80 patients with ASA I-II grades combined spinal-epidural anesthesia who underwent voluntary postoperative analgesia after cesarean section were divided into parecoxib sodium group (P group) and control group (C group) according to the random number table, 40 cases in each. After the fetus was delivered, group P received i.v. injection of parecoxib sodium 40 mg, and group C received i.v. injection of the same amount of normal saline. After the operation, self-controlled i.v. analgesia with dezocine was used, and the analgesic solution was dezocine 0.5 mg /kg + normal saline to 100 mL. Adopt LCP mode of administration was used: loading dose (dezocine 5 mg) + maintenance dose 2.0 mL/h + single PCA dose 1 mL, lock-in time 15 min. The visual analog (VAS) pain scores at 2, 4, 8, 12, and 24 h after the operation of the parturient were recorded. The degree of uterine contraction pain within 24 h after the operation was recorded, and the satisfaction of the parturient鈥瞫 analgesia and overall adverse reaction rate were compared. Results: The VAS scores of the incision at 8 and 12 h in the P group were significantly lower than those in the C group (P < 0.05). The degree of postoperative uterine contraction pain in group P was significantly lower than that in group C (P < 0.05). The overall satisfaction of analgesia in group P was significantly higher than that in group C (P < 0.05). There was no significant difference in the incidence of overall adverse reactions between the two groups (P > 0.05). Conclusion: Parecoxib sodium can enhance the effect of dezocine for i.v. patient-controlled analgesia after cesarean section, reduce the degree of uterine contraction pain, and improve women鈥瞫 satisfaction without increasing adverse reactions.

Guangdong Yixue 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, Computed Properties of 198470-85-8.

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

Mallick, Sudesh published the artcileOxidative Coupling of Carbazoles: A Substituent-Governed Regioselectivity Profile, Synthetic Route of 57103-14-7, the publication is Journal of Organic Chemistry (2019), 84(1), 73-93, database is CAplus and MEDLINE.

Oxidative C-C coupling of carbazoles possessing various substituents is demonstrated in the presence of organic (metal-free) recyclable oxidants, such as DDQ or CA/H⁺, for accessing bicarbazole regioisomers. Differently substituted carbazoles are examined to showcase regioselective discrimination (3,3′- vs. 1,3′-bicarbazoles) and preferences based on sterics and electronics in oxidative coupling. Finally, a mechanism that involves the carbazole radical cation has been traced (evidenced) and proposed on the basis of the UV-vis-NIR absorption and EPR spectroscopy results. This study underlines the strategic chem. preparation of a series of bicarbazoles in an efficient manner.

Journal of Organic Chemistry 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, Synthetic Route of 57103-14-7.

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

Li, Chang-liang published the artcileGradient elution HPLC for related substances in parecoxib sodium for injection, Name: Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, the publication is Zhongnan Yaoxue (2014), 12(3), 268-270, database is CAplus.

An HPLC method was developed to determine the relevant substances in parecoxib sodium for injection. An Agilent C₁₈ column (150 mm 脳 4.6 mm, 5 渭m) was used with gradient elution. The flow-rate was 1 mL 路 min^-1. The detection wavelength was 214 nm. Parecoxib and the adjacent impurities were effectively separated The sample solution was stable in 12 h at the room temperature The average recoveries low, middle and high concentration of valdecoxib was 100.2%, 100.3% and 99.4%. The method is accurate, reliable and reproducible, and can be used for the quality control of the preparation

Zhongnan Yaoxue 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, Name: Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide.

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

Luo, Xi published the artcileAnalgesic effect of different dosage of Flurbiprofen axetil in laparoseopic cholecystectomy in comparison with other analgesic drugs, Recommanded Product: Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, the publication is Pakistan Journal of Pharmaceutical Sciences (2017), 30(5), 1895-1898, database is CAplus.

Flurbiprofen axetil is a non-selective cyclooxygenase inhibitor. It can target the aggregation with lipid micro sphere as drug carrier. and exert analgesic effect in surgical incision and inflammatory site. In laparoscopic cholecystectomy comparative study on analgesic effect of parecoxib and flurbiprofen axetil is relatively less. Therefore. this paper is mainly based on the observation of patients after resting VAS score. adverse reaction time and movement. to evaluate the analgesic effect of different drug dose of flurbiprofen and parecoxib sodium. which provides reference for clin. medication. The results show that the i.v. injection of parecoxib could provide effective analgesic effect in laparoscopic cholecystectomy. Also. compared with flurbiprofen. parccoxib shows a more significant analgesic effect.

Pakistan Journal of Pharmaceutical Sciences 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, Recommanded Product: Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide.

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

Li, Long published the artcileRegioselectivity Switch in Palladium-Catalyzed Allenylic Cycloadditions of Allenic Esters: [4+1] or [4+3] Cycloaddition/Cross-Coupling, Category: isoxazole, the publication is Angewandte Chemie, International Edition (2019), 58(14), 4710-4713, database is CAplus and MEDLINE.

The first Pd-catalyzed asym. allenylic [4+1] cycloaddition was successfully developed. Alternatively, tuning the Pd catalyst switched the reactivity toward an unprecedented [4+3] cycloaddition/cross-coupling. Ligands play a vital role in controlling the reaction pathway, allowing highly selective access to different products from identical substrates. Biol. evaluation of the obtained compounds led to the discovery of new antitumor targets. A possible mechanism is proposed, suggesting two interesting catalytic cycles for the cycloaddition with palladium-butadienyls. This study also demonstrated the potential and utility of allenic esters as 1,4-biselectrophiles and C₄ synthons for participating in cycloaddition reactions.

Angewandte Chemie, International Edition 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, Category: isoxazole.

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

Xiao, J. published the artcileHighly efficient green and red phosphorescent OLEDs using novel bipolar blue fluorescent materials as hosts, HPLC of Formula: 1313391-57-9, the publication is Synthetic Metals (2014), 89-93, database is CAplus.

The authors studied highly efficient green and red phosphorescent organic light-emitting diodes (OLEDs) based on two kinds of Ir complexes as the guests and two novel 1,3,5-triazine derivatives as the host materials, resp. For comparison, the devices using a common fluorescent host 4,4′-N,N’-dicarbazolebiphenyl (CBP) also were fabricated. All devices using 1,3,5-triazine derivatives as host have better performance than that of CBP. This may be attributed to the adoption of the hosts, which have suitable HOMO/LUMO levels enabling excitons to form on host and hence favoring efficient energy-transfer from host to guest. The high bipolar carrier mobility of the host is critical to this kind of doping system, which would balance the injection of both carriers and improve efficiency.

Synthetic Metals published new progress about 1313391-57-9. 1313391-57-9 belongs to isoxazole, auxiliary class OLED Materials,Red Fluorescence Dopants, name is 3-(4,6-Diphenyl-1,3,5-triazin-2-yl)-9-phenyl-9H-carbazole, and the molecular formula is C7H5ClN2S, HPLC of Formula: 1313391-57-9.

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

Green, Luke published the artcileUV-Induced 1,3,4-Oxadiazole Formation from 5-Substituted Tetrazoles and Carboxylic Acids in Flow, Formula: C8H5F3N4, the publication is Chemistry – A European Journal (2020), 26(65), 14866-14870, database is CAplus and MEDLINE.

A range of 1,3,4-oxadiazoles I (R¹ = cylopropanyl, C₆H₅, 2-MeOC₆H₄, 4-FC₆H₄, etc.; R² = Me, C₆H₅, 4-MeC₆H₄, 2-furanyl, etc.) have been synthesized using a UV-B light activated flow approach starting from carboxylic acids and 5-substituted tetrazoles. The application of UV light represents an attractive alternative to the traditional thermolytic approach and has demonstrated comparable efficiency and versatility, with a diverse substrate scope, including the incorporation of highly substituted amino acids.

Chemistry – A European Journal 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 C8H5F3N4, Formula: C8H5F3N4.

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