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. Author manuscript; available in PMC: 2010 Dec 2.
Published in final edited form as: J Am Chem Soc. 2009 Dec 2;131(47):17087–17089. doi: 10.1021/ja907924j

Scheme 5. Synthesis of the southern fragment 8a.

Scheme 5

aConditions: (a) 5 mol% [Rh(COD)Cl]2, 10 mol% [m-F(C6H6)]2PCH2CH2P[m-F(C6H6)]2, DMF, 55%; (b) CH2=CHOTBS, Montmorillonite K-10, CH2Cl2, 82%.