Two-step conversion of 2-substituted furans into γ-oxo-α,β-unsaturated carboxylic acids. Formal synthesis of (+)-patulolide A and (−)-pyrenophorin
摘要:
NBS oxidation of 2-substituted furans 9 and 15 followed by further oxidation of the enals with NaClO2 afforded the acids II and 17 in good yields, which are the intermediates of(+)-patulolide A and (-)-pyrenophorin, respectively. Copyright (C) 1996 Elsevier Science Ltd