Scheme 2. Scope of 1,3-diones. Reaction conditions: 1 (0.1 mmol), 2a (0.2 mmol), MesCO2Li (0.15 mmol), and [RuCl2(p-cymene)]2 (5 mol%) in toluene (2 mL) at 120 °C in air for 24 h.
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