Table 1.

Reaction condition optimization

Entry	Conditionsa	Yieldb
1	(+)Pt/(−)Pt, DIEA (5 eq.), DCE, 1 h	32%c
2	(+)Pt/(−)Pt, DIEA (5 eq.) THF, 45 min	35% (α : β = 1:2.1)c
3	(+)Zn/(−)Pt, DIEA (5 eq.) THF, 30 min	94% (α : β = 1 : 1.3)
4	(+)Zn/(−)C, DIEA (5 eq.) THF, 30 min	22% (α : β = 1 : 1.3)
5	(+)Zn/(−)Sn, DIEA (5 eq.) THF, 30 min	84% (α : β = 1 : 1.5)
6	(+)Mg/(−)Sn, DIEA (5 eq.) THF, 30 min	66% (α : β = 1 : 1.2)
7d	(+)Zn/(−)Sn, DIEA (3 eq.) THF, 1 h	93% (α : β = 1 : 1.3)
8d	(+)Zn/(−)Sn, NEt3 (3 eq.) THF, 1 h	93% (α : β = 1 : 1.6)
9	(+)Zn/(−)Sn, no base THF, 1 h	67% (α : β = 1 : 1.2)

^aThe reactions were carried on 0.1 mmol scale.

^bRepresents isolated yield.

^cDetermined by ¹⁹F NMR with trifluorotoluene as internal standard.

^dTBAClO₄ = 0.15M