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Reagents and conditions: (a)651 LiHMDS (6.6 equiv), 1,2,4-trichlorobenzene 120 °C, 1 h; (b) 349.3a (2 equiv) or 349.3a (2 equiv), 1,2,4-trichlorobenzene 120 °C, 2 h; (c) DBU (116 equiv), DCM, rt, 1 h; (d) CH3COOH (excess), DCM, rt, N2, 1 h
