A new type of dimroth rearrangement: formation of 1,2-dihydro-3H-quinazolone 4-oximes from 4-amino-1,2-dihydroquinazoline 3-oxides
作者:Dezs? Korbonits、P�l Kolonits
DOI:10.1039/p19860002163
日期:——
Contrary to earlier claims the primary product of the reaction of aldehydes and o-aminobenzamide oxime is, irrespective of the aldehyde, always a 4-amino-1,2-dihydroquinazoline 3-oxide. Thermolysis of 1-unsubstituted 2-substituted quinazoline 3-oxides (5) in solution or in melt gives rise, by a new type of Dimroth rearrangement, to the isomeric 1,2-dihydro-4-quinazolone oximes (6), while the 1-benzyl