F. Palacios et al., PREPARATION AND REACTIVITY OF ELECTRON-POOR 2-AZADIENES - DIELS-ALDERREACTION WITH TRANS-CYCLOOCTENE, Tetrahedron letters, 34(27), 1993, pp. 4377-4380
Di-, tri- and tetra- substituted 2-azadienes 3 underbar with electron
withdrawing groups have been obtained by Aza-Wittig reaction of N-viny
lic phosphazenes with carbonyl compounds. The Diels-Alder reaction of
3 underbar with trans-cyclooctene has also been explored.