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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Apr 14;19(11):3002–3005. doi: 10.1016/j.bmcl.2009.04.027

Scheme 1.

Scheme 1

Reagents and conditions: (a) (i) IBX, CH3CN; (ii) (EtO)2P(O)C=PPh3, DMSO (44%); (b) H2, Pd/C, MeOH (84%); (c) TMSBr, CH2Cl2 (62%); (d) Bu3N, CDI, DMF; (Bu3NH)2H2P2O7; TEAB 1M (22%); (e) TMSBr, CH2Cl2 (65%).