Ketenimines as intermediates to heterocycles. Part 3. Rearrangement of 3-iminoisoxazolines to 2-imino-oxazolines
作者:Francesco De Sarlo、Antonio Guarna、Paolo Mascagni、Robert Carrié、Pierre Guenot
DOI:10.1039/p19810001367
日期:——
hydroxylamines (2) add to 2-benzoyl-N,2-diphenylvinylideneamine (1) and the adducts are easily dehydrated to give the 3-iminoisoxazolines (4). Compounds (4) with 2-aryl substituents rearrange spontaneously to give the 2-imino-oxazolines (5) or (6), but the 2-methyl derivative is more stable and only rearranges on heating. 2-Imino-3-acylaziridines (8) or (9) are assumed to be the intermediates; the expected
N-取代的羟胺(2)加到2-苯甲酰基-N,2-二苯基亚乙烯基胺(1)中,加合物易于脱水,得到3-亚氨基异恶唑啉(4)。具有2-芳基取代基的化合物(4)自发地重排,得到2-亚氨基-恶唑啉(5)或(6),但是2-甲基衍生物更稳定并且仅在加热时重排。假定2-Imino-3-acylaziridines(8)或(9)为中间体;在尝试从苯甲酰基苯基碳烯和二苯基碳二亚胺合成1,3-二苯基-2-苯基亚氨基-3-苯甲酰基氮丙啶(8b)的过程中,从产物中分离出了预期的2-亚氨基恶唑啉(5b)。