Scheme 4.
Reagents and conditions: (a) RSH/NaH/DMF; (b) (Boc)2O/DMAP/CH2Cl2; (c) LiEt3BH/THF/CH2Cl2/−78 °C; (d) TFA; (e) BocNHCH(CH2CH2SH)CO2t-Bu/LDA/DMF; (f) D/L-Hcy/NaH/DMF; (g) BnONH2/pyr
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