Iron-catalyzed aerobic oxidative aromatization of 1,3,5-trisubstituted pyrazolines
作者:Guddekoppa S. Ananthnag、Adithya Adhikari、Maravanji S. Balakrishna
DOI:10.1016/j.catcom.2013.09.002
日期:2014.1
A simple and high yielding method for the synthesis of tri-substituted pyrazoles via iron(III) catalyzed aerobic oxidative aromatization of pyrazolines has been reported. The process demonstrates a variety of functional group tolerance.
In this paper, 21 naphthalene-chalcone derivatives were synthesized and their biologicaleffects were evaluated. The results showed that compounds 2a–2u displayed clear antidepressant activity at 30 mg/kg in the forced swimming test. Compounds 2h, 2o, 2t, and 2u exhibited a good antidepressant effect in the forced swimming test and tail suspension test at 30 mg/kg. Compounds 2h, 2o, 2t, and 2u but
manganese(VII)‐mediated regio‐ and diastereoselectiveacyloxyarylation of chalcones is unveiled. Heating a solution of a chalcone and an arylboronic acid in an aliphatic carboxylic acid at 80 °C for 1 h afforded the corresponding 1‐acyloxy‐3‐oxo‐1,2,3‐triarylpropanes in high yields. The β‐acyloxy‐α‐arylation/elimination sequence can be regarded as an indirect α‐arylation of chalcones.
A novel and practical approach to access saturated ketones from unsaturated ketone derivatives via a CS2/t-BuOK system in dimethyl sulfoxide (DMSO) is reported. The in situ generation of xanthate salt through the reaction of carbon disulfide and potassium tert-butoxide is essential to this transformation. Deuterium-labeling experiments demonstrated that DMSO can act as a hydrogen donor.
palladium-catalyzed carbonylative Heck reaction of aryl thianthrenium salts with carbon monoxide and alkenes has been developed. This protocol can greatly reduce the quantity of olefins used in the carbonylative Heck reaction. In addition, the reaction can also proceed when the coupling partner is a non-activated olefin which is not common in such carbonylative Heck reactions. Combined with C–H thianthrenation