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. Author manuscript; available in PMC: 2012 Sep 15.
Published in final edited form as: Bioorg Med Chem. 2011 Jul 28;19(18):5507–5519. doi: 10.1016/j.bmc.2011.07.043

Scheme 6.

Scheme 6

Reagents and conditions: (a) H2/Pd-C/EtOH/rt; (b) SeO2/H2O2/Me2CO/−4°C; (c) TBAF/THF; (d) MsCl/Et3N/CH2Cl2/−4 °C; (e) BocNHCH(CH2CH2SH)CO2t-Bu/LDA/DMF/−20 °C; (f) (i) TFA/−4°C, (ii) TFA/H2O/−4 °C.