Abstract
Abstract The title compounds were hydrogenolyzed over Pd–C. The ring-bond cleavage in the hydrogenolysis of the acid in water or methanol occurred at both the C1–C2 bond and the C2–C3 bond in nearly equal proportion, whereas the C1–C2 bond was cleaved mainly in the presence of ammonia and the C2–C3 bond was cleaved mainly in acetic acid. Selective hydrogenolysis of the C1–C2 bond of ester occurred in hexane or methanol, whereas the C2–C3 bond was hydrogenolyzed mainly in acetic acid. The role of the amino group is discussed.
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