Preparation process of ginkgolide b from ginkgolide c

Details Preparation process of ginkgolide b from ginkgolide c Preparation process of ginkgolide b from ginkgolide c

C - Chemistry, Metallurgy

07

D

C07D 493/22 (2006.01) C07H 19/01 (2006.01)

Patent

CA 2147423

A two-step process for converting ginkgolide C into ginkgolide B is disclosed. In the first step, ginkgolide C is reacted with a sulfonic anhydride to obtain a C-7 sulfonate of ginkgolide C. In the second step, the C-7 sulfonate of ginkgolide C is reacted with a borohydride, and this reaction eliminates the C-7 radical of the C-7 sulfonate of ginkgolide C, thus producing gingkolide B.

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