FIELD: chemical industry. SUBSTANCE: described is method of preparing ginkgolide B from ginkgolide C which comprises reacting ginkgolide C with sulfonic acid anhydride to produce C-7- sulfonate of ginkgolide C and subsequently reacting the latter with borohydride in aprotic solvent. The reaction causes elimination of C-7-radical of C-7- sulfonate of ginkgolide C and formation of ginkgolide B. EFFECT: simplified process. 12 cl, 6 ex
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