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Reaction conditions of Step III: Ugi reaction crude (0.1–0.5 mmol), 0.1 M TfOH, 55 °C, 4 h, conventional heating. ayields from the one-pot procedure without isolation of GBB intermediates; btotal yields calculated over the two-step procedure with isolated GBB intermediates; cyields from only the deprotection step III with purified GBB intermediates.
