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Reagents and conditions: (a) Cu(OAc)2, DBU, DMSO, μw 110–180 °C, 7 min to 24 h (15–25%); (b) NH4Cl, TBTU, NMM, DMF, rt. 1.5–16 h (74–100%); (c) chiral chromatography; (d) LiOH, THF, MeOH, water, rt. 3–19h (45–83%).
