All articles of this category Intermolecular hetero Diels-Alder reactions of the heterodiene 3 [ N -(4-ethoxy-1,2-dioxo-3-butenyl)-1,3-oxazolidin-2-one] with ( Z )-1-acetoxy-2-ethoxyethene ( 4 ) and 3,4-dihydro-2 H -pyran ( 7 ) were studied in the presence of several Lewis acids and trimethylsilyl trifluoromethanesulfonate (TMS-OTf). Depending on the Lewis acid used a stereoselective formation of either the endo - or the exo -Diels-Alder product was observed.
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Tietze et al. (1992) studied this question.