One-Pot Copper(I)-Catalyzed Synthesis of 3,5-Disubstituted Isoxazoles
作者:Trond V. Hansen、Peng Wu、Valery V. Fokin
DOI:10.1021/jo050163b
日期:2005.9.1
3,5-Disubstituted isoxazoles are obtained in good yields by a convenient one-pot, three-step procedure utilizing a regioselective copper(I)-catalyzed cycloaddition reaction between in situ generated nitrile oxides and terminal acetylenes. Most functional groups do not interfere with the reaction, which can be performed in aqueous solvents without protection from oxygen. Since all reagents are used
One-Pot Synthesis of Isoxazolines from Aldehydes Catalyzed by Iodobenzene
作者:Jie Yan、Liuquan Han、Bijun Zhang、Changbin Xiang
DOI:10.1055/s-0033-1340464
日期:——
finally, a 1,3-dipolarcycloaddition between the nitrileoxides and alkenes occurs to provide the isoxazolines in moderate to good yields. A convenient one-pot, three-step procedure for the synthesis of isoxazolines starting from aldehydes has been developed involving catalytic cycloaddition between nitrileoxides and alkenes, in which iodobenzene is used as the catalyst for the in situgeneration of a hypervalent
Addition of Allylindium Bromide to Nitrile Oxides in Aqueous Media: Convenient Synthesis of 5-Methylisoxazolines
作者:Sanghapal D. Sawant、Parvinder P. Singh、Naveed A. Qazi、H. M. Sampath Kumar
DOI:10.1246/cl.2007.296
日期:2007.2
5-Methylisoxazolines were obtained in good yields through a highly selective nucleophilic addition of allylindium reagent to benzonitrile oxides with concominant C-O heterocyclization.
通过将烯丙基试剂高度选择性地亲核加成到氧化苄腈并伴随 CO 杂环化,以良好的收率获得了 5-甲基异恶唑啉。
Dibenzazepine-linked isoxazoles: New and potent class of α-glucosidase inhibitors
作者:Umm-E-Farwa、Saeed Ullah、Maria Aqeel Khan、Humaira Zafar、Atia-tul-Wahab、Munisaa Younus、M. Iqbal Choudhary、Fatima Z. Basha
DOI:10.1016/j.bmcl.2021.127979
日期:2021.5
diabetes. In the current study, new molecules as a hybrid of isoxazole and dibenzazepine scaffolds were designed, based on their literature as antidiabetic agents. For this, a series of dibenzazepine-linked isoxazoles (33-54) was prepared using Nitrile oxide-Alkyne cycloaddition (NOAC) reaction, and evaluated for their α-glucosidase inhibitory activities to explore new hits for treatment of diabetes
Design and synthesis of spiro derivatives of parthenin as novel anti-cancer agents
作者:Doma Mahendhar Reddy、Naveed A. Qazi、Sanghpal D. Sawant、Abid H. Bandey、Jada Srinivas、Mannepalli Shankar、Shashank K. Singh、Monika Verma、Gousia Chashoo、Arpita Saxena、Dilip Mondhe、Ajit K. Saxena、V.K. Sethi、Subhash C. Taneja、Gulam N. Qazi、H.M. Sampath Kumar
DOI:10.1016/j.ejmech.2011.04.030
日期:2011.8
Several novel Spiro derivatives of parthenin (1) have been synthesized by the dipolar cycloaddition using various dipoles viz; benzonitrile oxides, nitrones and azides with exocyclic double bond of C ring (alpha-methylene-gamma-butyrolactone). Majority of the compounds exhibited improved anti-cancer activity compared to the parthenin, when screened for their in vitro cytotoxicity against three human cancer cell lines viz., SW-620, DU-145 and PC-3. In vivo screening of select analog revealed improved anti-cancer activity with low mammalian toxicity as compared to parthenin. The results of the cytotoxicity pattern of these derivatives reveals the SAR of these sesquiterpinoid lactones and possible role of alpha,beta-unsaturated ketone of parthenin in inhibiting NF-kB. A mechanistic correlation of anti-cancer activity along with in vivo and western blotting experiments has been described. (C) 2011 Elsevier Masson SAS. All rights reserved.