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Reagents and conditions: (a) (1) LDA, THF, −78 °C, 1 h; (2) RCHO, −78 °C, 1 h; (b) NaH, THF, MsCl, reflux, 48 h; (c) imidazole, NaH, DMF, 100 °C, 12 h; (d) Pd(OAc)2, PPh3, Cy2NMe, DMF, 100 °C, 5 h.
