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Reagents and conditions: Pathway A: (e) ethyl bromoacetate 8, CS2, acetonitrile r.t, 12–24 h. (f) NaOAc, glacial acetic acid, stirring, reflux 6–8 h. Pathway B: (g) ethyl chloroacetate 12 (1 mmol), r.t 30 min–1 h, CS2 (2 mmol) in (2 mL) DMF, KOH (3 mmol) and 10 a,b (1 mmol), r.t overnight.
