Diastereoselective construction of highly functionalized tetrahydroquinolinoisoxazole scaffolds via intramolecular nitrone cycloaddition
作者:Manickam Bakthadoss、Anthonisamy Devaraj
DOI:10.1016/j.tetlet.2015.05.004
日期:2015.6
A novel strategy towards the construction of highly diversified tetrahydroquinolinoisoxazole frameworks with high diastereoselectivity viaintramolecular 1,3-dipolar nitronecycloaddition reaction is described for the first time. All the synthesized tetrahydroquinolinoisoxazoles are new and obtained in excellent yields under catalyst free condition.
Synthesis of isothiosemicarbazones of potential antitumoral activity through a multicomponent reaction involving allylic bromides, carbonyl compounds and thiosemicarbazide
作者:Laiéli S. Munaretto、Misael Ferreira、Daniela P. Gouvêa、Adailton J. Bortoluzzi、Laura S. Assunção、Juliana Inaba、Tânia B. Creczynski-Pasa、Marcus M. Sá
DOI:10.1016/j.tet.2020.131231
日期:2020.6
of isothiosemicarbazones and 2-hydrazono-1,3-thiazin-4-ones through a multicomponent reaction featuring allylic bromides, carbonylcompounds and thiosemicarbazides is described. The transformations proceed under mild and environmentally benign conditions with high yields and stereoselectivity. All novel compounds were obtained in high purity without the need for chromatography stages. Different functional
Poles apart: The sterically directed [3+2] cycloaddition reactions of dipoles that were generated from Baylis–Hillman bromides with isatin dipolarophiles provided a facile synthetic route to spirodihydrofuran oxindoles and spiroepoxy oxindoles (see scheme). a)–c) Me2S, Cs2CO3, DMF, 15–20 °C, N2, 8 h. EWG: a) CO2Me (Z), b) CO2Me, and c) CN (E).
A series of 28 aryl- and alkyl-substituted isothiouronium salts were readily synthesized in high yields through the reaction of allylic bromides with thiourea, N-monosubstituted thioureas or thiosemicarbazide. The S-allylic isothiouronium salts substituted with aliphatic groups were found to be the most effective against leukemia cells. These compounds combine high antitumor activity and low toxicity
A new route to allyl thiols and allyl thiocarbamates from Baylis-Hillman adducts
作者:Young-Gi Kim、Hee Nam Lim、Kee-Jung Lee
DOI:10.1002/jhet.3
日期:2009.1
A facile synthesis of trisubstituted allyl thiols and allyl thiocarbamates has been accomplished from Baylis-Hillman adducts through bromination, thiocyanation, and acid-assisted hydrolysis reaction. J. Heterocyclic Chem., (2009)