Scheme 7. Synthesis of α-Alkylidene-γ-lactones from Tricarbonyl Compounds 5.
Reaction conditions: 5 (0.1 mmol) and NaBH4 (1.2 equiv) in MeOH (1.3 mL), stirred at 0 °C for 30 min. b9g + 9g′ (0.1 mmol), RhCl3·3H2O (1 mol %) in EtOH at 80 °C.
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