Scheme 1. (a) Boc2O, H2O/DMSO (1:6), 5 h, 60 °C, 80%; (b) Succinic Anhydride (1.5 equiv) and DMAP (5 equiv) in Toluene, Overnight, 85 °C, 60%; (c) Solid Phase Synthesis Followed by TFA/TIPS/DODT/H2O (82:5:8:5 v/v), 3 h, rt, > 90%.
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