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Reagents and conditions: (i) piperidine/DMF; (ii) 4, HOAt, PyAOP, DIPEA, μwave, 60 °C, 5 min; (iii) piperidine/DMF; (iv) Fmoc-Gly-OH, HOAt, PyAOP, DIPEA, 2 h; (v) piperidine/DMF; (vi) Fmoc-Leu-OH, HOAt, PyAOP, DIPEA, 2 h; (vii) TBAF, DMF, 1 h; (viii) piperidine/DMF; (ix) HOAt, PyAOP, DIPEA, μwave, 60 °C, 5 min; (x) TFA/H2O/TIPS.
