Scheme 1.
Synthesis of 2-bromo-4-chlorophenyl-2-bromobutyrate (3). Conditions: (i) 1 (1 g, 4.820 mmol), 2 (0.64 mL, 5.3 mmol), pyridine (0.7 mL, 9.63 mmol), MeCN (30 mL), 0 °C, 1 h.
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