A facile oxidative halogenation of α-oxo ketene dithioacetals is achieved by using a potassium halide and oxidant combination under transition metal free conditions at ambient temperature. Using this methodology, halogenatedketene dithioacetals are synthesized in good to excellent yields with a short reaction time. The halogenated products are successfully transformed into nitrogen containing heterocyclic
Base catalyzed reaction of 1,4-dithiane-2,5-diol with α-oxoketene dithioacetals: a new general method for the synthesis of 2-methylthio-3-aroyl/heteroaroyl thiophenes
The α-oxoketene dithioacetals and 1,4-dithiane-2,5-diol a dimer of mercapto acetaldehyde, react in the presence of anhydrous potassium carbonate in boiling ethanol to yield the corresponding 2-(methylthio)-3-aroyl/heteroaroyl thiophenes in 55–70% overall yields.
Transition-metal-free solid phase synthesis of 1,2-disubstituted 4-quinolones via the regiospecific synthesis of enaminones
作者:Ajjampura C. Vinayaka、Toreshettahally R. Swaroop、Prasanna Kumara Chikkade、Kanchugarakoppal S. Rangappa、Maralinganadoddi P. Sadashiva
DOI:10.1039/c5ra21421a
日期:——
Herein, the transition-metal-free economical solidphasesynthesis of 1,2-disubstituted 4-quinolones has been developed via the novel regiospecific synthesis of enaminones. Notably, a wide range of enaminones were synthesized via a silica-supported solid-phase reaction in good to excellent yields. The transformation of enaminones to 1,2-disubstituted 4-quinolones and N-methyl-2-aryl-4-quinolone alkaloid