ABSTRACT
A number of azoloquinazolines has been efficiently synthesized in the cyclocondensation reaction of azoloazines with α,ß-unsaturated carbonyl compounds activated with ultrasound. Two main advantages of the suggested procedure are shorter reaction time and higher yields compared to reflux and stirring at room temperatures. In addition, the yields of dehydrogenization products were decreased.
Subject(s)
Heterocyclic Compounds, 3-Ring/chemical synthesis , Quinazolines/chemical synthesis , Ultrasonics , Cyclization , Heterocyclic Compounds, 3-Ring/chemistry , Molecular Structure , Quinazolines/chemistry , StereoisomerismABSTRACT
Initial stages of "low temperature" carbonization in crystal amino acids have been studied by ESR- and IR-spectroscopy. It was revealed that block polycondensation of amino acids with the formation of polypeptide chains took place. In the air oxygen also surface carbonization of crystals took place; it became stronger with the occurrence of radiation defects.
