1.1
Reagents:
Piperidine, 2,2,6,6-tetramethyl-, lithium salt (1:1)
Solvents:
Tetrahydrofuran
,
Hexane
;
5 min, 0 °C
1.2
Reagents:
Dichloro(N,N,N′,N′-tetramethylethylenediamine)zinc
;
15 min, 0 °C
1.3
0 - 10 °C; 2 h, rt
1.4
Reagents:
Iodine
Solvents:
Tetrahydrofuran
;
overnight, rt



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