1.1
Solvents:
Dichloromethane
;
0 °C; 30 h, 0 °C → 40 °C; 40 °C → 0 °C; 2 h, 0 °C
1.2
Reagents:
Sodium hydroxide
Solvents:
Water
;
2 h, rt
2.1
Reagents:
N-Bromosuccinimide
Solvents:
Dimethylformamide
,
Tetrahydrofuran
;
-40 °C; 1 h, -40 °C; -40 °C → -10 °C; 2 h, -10 °C

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