Abstract
A stereoselective synthesis of the spirolactam fragment (C31–C41) of a highly-potent immunosuppressant sanglifehrin A is described. The key steps involved in this synthesis are a desymmetrization protocol, Sharpless asymmetric epoxidation, Crimmins syn aldol reaction, Barton–McCombie deoxygenation, and acid-mediated spirolactamization.
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