Eponemycin, a highly potent specific in vivo antitumour antibiotic against B16 melanoma, which was previously isolated from culture filtrates of Streptomyces hygroscopicus No. P247–71, is synthesized.
The present invention provides a preparation method for a natural product Trabectedin. Specifically, the present invention provides a preparation method for Et-743. In the method, tyrosine is used as an initial substrate, and after 26 steps of reaction, the Et-743 is synthesized. Raw materials and agents used in the synthetic route can all easily be obtained, reaction conditions are relatively mild, and preparation in large scale can be implemented.
Eponemycin, an antibiotic with a highly potent and specific antitumor activity against B16 melanoma cells in vivo, has been synthesized. The framework of the western half of the molecule was built up from N-trityl-γ, δ-didehydroleucinal and the dilithium derivative LiO-CH2C(Li)=CH2. In the final step, a vinyl ketone was oxidized nonstereoselectively to give a mixture of three isomers from which eponemycin was isolated in 40% yield.