SYNTHETIC COMMUNICATIONS, cilt.38, sa.2, ss.212-216, 2008 (SCI-Expanded)
Alkylation of 2-methoxyfuran, followed by in situ TPP-sensitized photooxygenation of 2-methoxy-5-pentylfuran in the presence of Me2S, gave methyl (Z)-4-oxonon-2-enoate. Hydrolysis of methyl (Z)-4-oxonon-2-enoate afforded (E)-4-oxonon-2-enoic acid in three steps and in 79% overall yield.