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
YADAV, J. S.;KRISHNA, P. RADHA;GURJAR, M. K., TETRAHEDRON, 54,(1989) N9, C. 6263-6270