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Reagents and conditions: (a)360 (1) SOCl2, dry DCM, reflux, (2) AlCl3, dry DCM, 0 °C to rt, overnight; (b) (1) (triisopropylsilyl)ethynyllithium, THF, 0 °C to rt, (2) SnCl2, toluene, rt, 12 h.
