Abstract
Practical syntheses of the C9–C14 sterotriade 5 and the C1–C8 polyene unit 6 in ansatrienine A (mycotriene) ( 1a), and other ansamycin antibiotics is described. A key step for controlling the configuration of the stereogenic center at C13 involves the stereoselective reduction of enone 10 using the Evans–Tishchenko reaction.
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