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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 9a.

Scheme 9a

a Reagents and conditions: (a) 67, 2,4,6-Cl3C6H2COCl, Et3N, DMAP, CH2Cl2; add 56 (75%); (b) hv (350 nm), THF; (c) CCl3CN, DBU, CH2Cl2 (50%, 2 steps); (d) 70, BF3·OEt2, CH2Cl2 (72%).