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Reagents and conditions (a) LiOH·H2O, MeOH, rt, 3 h, 58%; (b) 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, hydroxybenzotriazole, N,N-diisopropylethylamine, MeCN, rt, 18 h, 55–66%; (c) benzotriazo-1-yloxytripyrrolidinophosphonium hexafluorophosphate, N,N-diisopropylethylamine, DCM, rt, 18 h, 66–74%; (d) 10% TFA in DCM (v/v), rt, 2 h, 18–81%.
