1.1
Reagents:
Piperidine, 2,2,6,6-tetramethyl-, lithium salt (1:1)
Solvents:
Tetrahydrofuran
;
< -65 °C; 15 min, -78 °C
1.2
Reagents:
Iodine
Solvents:
Tetrahydrofuran
;
1 h, -78 °C; -78 °C → rt
1.3
Reagents:
Water
1.4
Reagents:
Hydrochloric acid
Solvents:
Tetrahydrofuran
,
Water
;
18 h, reflux; reflux → rt

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