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Enantioselective 5-endo-dig Carbocyclization of β-Ketoesters with Internal Alkynes Employing a Four-Component Catalyst SystemSatoru Suzuki; Etsuko Tokunaga; Dhande Sudhakar Reddy; Takashi Matsumoto; Dr. Motoo Shiro; Prof. Norio Shibata · 2012