摘要:
In four reaction steps, ginkgolide A (1) was synthesized from the enol-acetate 3, which is available in six steps from 1. The key step was the reaction of the ol-epoxy-acetate 4 with the lithium enolate of methyl propionate to give the compounds 5 and 6. C-14-Labelled ginkgolide A, which is of interest for pharmacological studies, can be synthesized using the C-14-labelled methyl propionate. (C) 2000 Elsevier Science Ltd. All rights reserved.