The chemistry of 5-oxodihydroisoxazoles VII1 conversion of heterocyclylisoxazol-5(2H)-ones to imidazoles by flash vacuum pyrolysis
作者:Rolf H. Prager、Yogendra Singh
DOI:10.1016/s0040-4020(01)88034-0
日期:1993.9
A number of 5-oxo-2,5-dihydroisoxazoles, substituted with nitrogen heterocycles at N-2, have been subjected to flashvacuumpyrolysis. Annelated imidazoles are obtained in excellent yields, and are presumed to arise by intramolecular cyclisation of an imino carbene intermediate. The heterocycles annelated in this manner include isoquinoline, quinoline, benzothiazole, quinazoline, phenanthridine, pyrimidine