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. Author manuscript; available in PMC: 2009 Jan 8.
Published in final edited form as: J Am Chem Soc. 2006 Sep 13;128(36):11906–11915. doi: 10.1021/ja062364i

Scheme 8a.

Scheme 8a

a Reagents and conditions: (a) CCl3CN, DBU, CH2Cl2 (95%); (b) Cs2CO3, allyl-Br, DMF (70%); (c) (B(C6F5)3), CH2Cl2 (59%, 1:7, α: β; plus 15% 34 and 21% 68); (d) NaOH, 1,4-dioxane; then Cs2CO3, H2O, MeOH; (e) KHCO3, BnBr, DMF (92%, 2 steps); (e) HCO2H, Pd(OAc)2), Et3N, PPh3, 1,4-dioxane (70%).