作者:RODRIGUEZ, H.、PAVEZ, H.、MARQUEZ, A.、NAVARRETE, P.
DOI:——
日期:——
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.