Spiro[4H-chromene-4,5′-isoxazolines] and related compounds: Synthesis and reactivities
作者:V. Ya. Sosnovskikh、A. Yu. Sizov、B. I. Usachev、M. I. Kodess、V. A. Anufriev
DOI:10.1007/s11172-006-0288-x
日期:2006.3
to give spiro[4H-chromene-4,5′-isoxazolines] in good yields. The isoxazoline ring in spiro[4H-chromene-4,5′-isoxazolines] undergoes opening under the action of conc. H2SO4, yielding α,β-unsaturated oximes. Their nitrosation and bromination lead to the corresponding spiroisoxazolines, while the Beckmann rearrangement, to α,β-unsaturated amides. The latter are also formed directly from spiro[4H-chromene-4