Chemical modification of the ester group of diketocoriolin B.

Abstract
5,8-Di-O-tetrahydropyranylcoriolin B (2) was synthesized and its 2 epoxide groups were resistant to alkaline hydrolysis to give di-O-tetrahydropyranyldihydrocoriolin (3). Acylation or alkylation of the free hydroxyl group at C-1 of 3 followed by hydrolysis of the tetrahydropyranylether groups and oxidation of the hydroxyl groups at C-5 and C-8 afforded a number of 1-O-acyl or alkyl analogs of diketocoriolin B. All of them showed antibacterial and antitumor activities.

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