Partial syntheses of some isomers of gibberellin A1 and gibberellin A3 methyl ester
The partial synthesis of an isomer of gibberellic acid methyl ester, with a lactone between C-6 and C-10 and an esterified acid group at C-19, is described. The overall yield from gibberellic acid was 46%. The preparation of 6-epi-GA1 has also been carried out. Its structure was confirmed by an X-ray analysis of its 1 β-iodo derivative.