The strong base-induced cycloaddition of 6-ethynyl-6-hydroxy-5,6,7,8-tetrahydrohomophthalic anhydride (10) to 5,8-dihydro-5,8-dioxoquinoline (11) constitutes a regiospecific and efficient route to the D-ring pyridine analogue (5) of 11 -deoxydau nomycin (2a).
Y. Kita, M. Kirihara, Y. Fujii, R. Okunaka, S. Akai, H. Maeda and Y. Tamura, J. Chem. Soc., Chem. Commun., 1990, 136 DOI: 10.1039/C39900000136
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