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. Author manuscript; available in PMC: 2009 Apr 15.
Published in final edited form as: Bioorg Med Chem Lett. 2008 Mar 14;18(8):2628–2632. doi: 10.1016/j.bmcl.2008.03.027

Scheme 2.

Scheme 2

(a) iodobutane, acetone, K2CO3, 60°C, 4 h (60−85%); (b) 1.5 equiv H2CrO4, acetone, 1 h (98%); (c) 9, EDC, DMAP, CH2Cl2 (83%); (d) (i). O3, CH2Cl2, −78°C, (ii) PPh3, (iii). cat. I2, CH2Cl2 (45%).