An unusual C-7 ortho ester from 6-epi-gibberellin A13. X-Ray molecular structure of gibberellene C-7 ortho ester
Abstract
Methanolysis of the 7,19-dimethyl ester of 3-acetoxy-6-epi-gibberellin A13 20-toluene-p-sulphonic anhydride afforded an unusual C-7 ortho ester as the major product. The preparation of 3,6-epi-GA37 methyl ester and of an interesting C-19 acetal is also described.