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. Author manuscript; available in PMC: 2011 May 13.
Published in final edited form as: J Med Chem. 2010 May 13;53(9):3602–3610. doi: 10.1021/jm901872v

Scheme 4.

Scheme 4

Reagents and conditions: (a) DAST, CH2Cl2 or (CH3OCH2CH2)2NSF3, CH2Cl2; (b) (i) (CH3)3SiCF3, CsF, CH3OCH2CH2OCH3 or (CH3)3SiCF3, TBAF, toluene, (ii) conc. HCl or TBAF, CH3COOH, THF.