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Reagents and conditions: (a) pivaloyl chloride, DCM dry, N2, from 0 °C to rt, 5 h; (b) K2CO3, Me2SO4, acetone, 60 °C, 16 h; (c) K2CO3, acetone, rt, 16–35 h; (d) Zn, NH4Cl, 10% water in MeOH, 70 °C, 5–7 h.
