Diels‐Alder‐Reaktionen von 2,4‐Bis{[(tert‐butyl)dimethylsilyl]oxy}‐3‐aza‐1,3‐pentadien mit Heterodienophilen

Diels‐Alder Reactions of 2,4‐Bis{[(tert‐Butyl)dimethylsilyl]oxy}‐3‐aza‐‐1,3‐pentadien with Heterodienophiles The 2,4‐bis{[(tert‐butyl)dimethylsilyl]oxy}‐3‐aza‐1,3‐pentadien(2) reacts via the Diels‐Alder adducts 3, 6a‐c, and 8a, b, which cannot be isolated, giving the triazines 4, 7a‐c, and the oxadiazines 9a, b. The hydrolysis of 4 in MeOH affords the N‐acetyl‐acetamid derivative 5. The formula of 9a is proven by an X‐ray‐structure analysis.