Flash-Vacuum-Pyrolysis (F.V.P) of 4-acetyl-3-(4-substitutedphenylamino)-2-(benzoxazol-2-yl)-isoxazol-5(2H)-ones

Flash-vacuum-pyrolysis (F.V.P) of the 4-acetyl-3-(4-substitutedphenylamino) -2-(benzoxazol-2-yl)-isoxazol-5-(2H)-ones (4) at 900oC and 0.4 mm Hg has been investigated and net product, 1-(2-(4-substitutedphenylamino)-imidazo-[2,1-b]-benzoxazol-3-yl)-ethanone in high to excellent yields (80-85%).

Isoxazolones; 2-chlorobenzo[d]oxazole; Imidazobenzoxazol; Flash-Vacuum-Pyrolysis (F.V.P).