X= Y-ZH systems as potential 1, 3-dipoles. Part 33. Generation of nitrones from oximes. Tandem Michael addition-1, 3-dipolar cycloaddition reactions. Class 2 …
P Armstrong, R Grigg, F Heaney, S Surendrakumar…
文献索引：Armstrong, Paul; Grigg, Ronald; Heaney, Frances; Surendrakumar, Sivagnanasundram; Warnock, William J. Tetrahedron, 1991 , vol. 47, # 25 p. 4495 - 4518
C-3,-4,-5, and-6-Alkenyl oximes react with electronegative olefins at the nitrogen atom via a Michael addition or ene-type process to generate the corresponding C-alkenyl nitrones which undergo an intramolecular cycloaddition. The cycloaddition can occur by one of two modes leading to either bridged-or fused-isoxazolidines. The latter is preferred in most cases except that of the C-(3-alkenyl) nitrone which gives exclusively the bridged-ring ...
