1.1: sodium hydride / dimethylformamide / 10 h / 20 °C 1.2: 77 percent / dimethylformamide / 1 h / 20 °C 2.1: 76 percent / 70 percent HF/pyridine; 1,3-dibromo-5,5-dimethylhydantoin / CH2Cl2 / 1 h / -78 - 0 °C View Scheme
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