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
与先前的权利要求相反,无论醛如何,醛与邻氨基苯甲酰胺肟反应的主要产物始终是4-氨基-1,2-二氢喹唑啉3-氧化物。通过新型的Dimroth重排,在溶液或熔融物中对1-un取代的2-取代的quinazoline 3-氧化物(5)进行热分解,生成异构体1,2-二氢-4-喹唑酮肟(6)。 1-苄基2-未取代的类似物(9j)可能是通过加成-消除环转化和氧化反应而生成的,是醌型喹唑酮4-肟(17)。