Heterocyclen aus α‐nitroolefinen. XII . 3‐Acetyl‐4,5‐dihydro‐5‐(methylenamino)furane und 3‐acylpyrrole aus α‐nitroolefinen und β‐diketonen

Abstract

From α‐nitroolefines 1 and β‐diketones 2 3‐acetyl4,5‐dihydro‐5‐(methy1eneamino)furans 5 are prepared. Furans 5 react in acid medium to yield 1‐unsubstituted 3‐acylpyrroles 6, catalytic hydrogenation yields 1‐substituted 3‐acylpyrroles 9. The 1H‐nmr and 13C‐nmr investigations prove the constitutions.