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  • Title: Total synthesis of (+)-sarain A.
    Author: Becker MH, Chua P, Downham R, Douglas CJ, Garg NK, Hiebert S, Jaroch S, Matsuoka RT, Middleton JA, Ng FW, Overman LE.
    Journal: J Am Chem Soc; 2007 Oct 03; 129(39):11987-2002. PubMed ID: 17850086.
    Abstract:
    This article describes the details of our synthetic studies toward the complex marine alkaloid sarain A. Various strategies were conceived, setbacks encountered, and solutions developed, ultimately leading to a successful enantioselective total synthesis. Our route to (+)-sarain A features a number of key steps, including an asymmetric Michael addition to install the C4'-C3'-C7' stereotriad, an enoxysilane-N-sulfonyliminium ion cyclization to set the C3 quaternary carbon stereocenter, and assemble the diazatricycloundecane core, a ring-closing metathesis to construct the 13-membered ring, an intramolecular Stille coupling to fashion the unsaturated 14-membered macrocycle, and a late-stage installation of the tertiary amine-aldehyde proximity interaction.
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