Diels-Alderreactions of 5-amino-8-hydroxy-1, 4-naphthoquinone () and derivatives (-) with cyclopentadiene and 2, 3-dimethylbuta-1, 3-diene afford the corresponding adducts - and - in good yields. Adducts and , by oxidation under alkaline conditions in the presence of air, are converted into quinones and , respectively. Quinone undergoes a novel transcycloaddition reaction with 2, 3-dimethylbuta-1