K. Paulini et al., ON THE REACTIVITY OF N,N-BIS(TRIMETHYL)SILYLATED ENAMINES - MODEL STUDIES ON HETERO-DIELS-ALDER REACTIONS AND OTHER CYCLOADDITIONS, Journal fur praktische Chemie, Chemiker-Zeitung, 337(3), 1995, pp. 209-215
In-situ generated nitroso alkenes underwent smooth hetero Diels-Alder
reactions with E-1-[N,N-bis(trimethylsilyl)amino]-1-propene (1) and fu
rnished 1,2-oxazines 7-9 in good yields. In contrast, the other n-disi
lylated enamines Z-1, 2, and 3 did not react with alpha nitrosostyrene
. Thus, a very simple kinetic separation of E/Z-1.