Oxidative intramolecular [4 + 2]cycloaddition of silylene-protected 2-pyridone derivatives—a short and efficient synthesis of the DEF-ring of fredericamycin A
Oxidative intramolecular [4 + 2]cycloaddition of silylene-protected 2-pyridone derivatives—a short and efficient synthesis of the DEF-ring of fredericamycin A