Regio and diastereoselective addition of imidazoline 3-oxides to aryl isocyanates
摘要:
Delta(3)-Imidazoline 3-oxides 1 underwent regio and diastereoselective cycloaddition with aryl isocyanates 2 to give 5,6,7,7a-tetrahydroimidazo[1,5-(b) under bar][1,2,4]oxadiazol-2(1 (H) under bar)-ones 3 in excellent yields. Thermally and chemically induced retro cycloaddition of compounds 3 was demonstrated. (C) 1997 Elsevier Science Ltd.
New Methods for the Synthesis of Imidazoline-N-Oxides
摘要:
DELTA3-Imidazoline-3-oxides were prepared by the reaction of corresponding aromatic Schiff bases with syn-2-bromoacetophenone oxime. 5,6-Dihydro-4H-1,2,5-oxadiazines were isolated as byproduct in some instances.