Reaction between Δ2-oxazolin-5-ones and nitrosobenzene. Formation of 1,2,4-oxadiazolines
作者:H. Rodríguez、H. Pavez、A. Márquez、P. Navarrete
DOI:10.1016/s0040-4020(01)97624-0
日期:——
2,4-diphenyl- and 2-p-methylphenyl-4-phenyl-Δ2-oxazolin-5-ones react at 80–110°C with nitrosobenzene to give benzamidines. However, reactions conducted at room temperature afford in high yield, the heretofore undescribed Δ4-1,2,4-oxadiazolin-3-carboxylic acids by regiospecific 1,3-dipolar cycloaddition. Thermal decomposition of the oxadiazolinecarboxylic acids gives the corresponding benzamidines.
2,4-二苯基-和2-对甲基苯基-4-苯基-Δ 2 -oxazolin -5-酮在80-110℃下用亚硝基苯,得到苄脒反应。然而,在室温下进行反应,以高收率得到,迄今未描述的Δ 4通过区域专一1,3-偶极环加成-1,2,4-恶二唑啉-3-羧酸。恶二唑啉羧酸的热分解得到相应的苯甲am。