Formal [3 + 3] Cycloaddition Reactions between Electron-Deficient Cyclopropenes and Hydrazones: A Route to Alkyl 1,4,5,6-Tetrahydropyridazine-3-carboxylates
作者:Hengrui Huo、Runa A、Yuefa Gong
DOI:10.1021/acs.joc.8b03105
日期:2019.2.15
regioselective fashion and gave alkyl 1,4,5,6-tetrahydropyridazine-3-carboxylates in high yields under mild basic conditions. Treatment of the annulation products with DDQ leads to the formation of functionalized pyridazine-3-carboxylates, analogues of nicotinicacidester.
Ionic liquids as a reusable media for copper catalysis. Green access to alkenes using catalytic olefination reaction
作者:Vasily M. Muzalevskiy、Aleksey V. Shastin、Namiq G. Shikhaliev、Abel M. Magerramov、Aytekin N. Teymurova、Valentine G. Nenajdenko
DOI:10.1016/j.tet.2016.09.050
日期:2016.11
It was demonstrated that ionicliquids are superb recyclable media for copper catalyzed reactions using catalytic olefination reaction as an example. As a result a novel green access to the halogenoalkenes was elaborated. Possibility to perform up to five reaction cycles without catalyst leaching and decreasing of the yield was demonstrated. A number of various ionicliquids was screened and 1-buty
triazinoindole-thiol-phenylethanone, followed by triazinoindole bis-Schiff base formation. Synthesized analogs showed β-glucuronidase potential with IC50 value ranging between 2.60 ± 0.10 to 55.40 ± 1.60 µM as compared to standard D-saccharic acid 1,4-lactone (IC50 = 48.10 ± 1.2 µM). Analog 20 was the most potent one with IC50 value 2.60 ± 0.10 µM. Analogs 17, 4 showed IC50 values 5.20 ± 0.20 and 5.70 ± 0.20 µM respectively
N-Amino-1,8-naphthalimide was used as a protectinggroup and a reagent to selective synthesis of various mono-N-substituted hydrazines and hydrazides. In all these reactions, the protecting reagent N-amino-1,8-naphthalimide was easily regenerated in good yields by the hydrazinolysis. All these transformations showed good functional-group tolerance and can be used for large scale C−N cross-coupling