Table 3.

Fluorocyclization by oxy- and carbofluorination using 1^[a]

Entry	Substrate	Method	t [h]	Product	Yield [%][b]
1		A	2		62
2		A	1		65
3		A	1		60
4		B	8		55
5		B	8		60
6[c]		B	8		76
7		B	4		60 (2:1)[d]

[a] Method A: 0.3 mmol of 4, Zn(BF₄)₂⋅x H₂O (5 mol %) and 1 (1.1 equiv) was reacted in CH₂Cl₂ (0.5 mL) at RT; Method B: 0.3 mmol of 6, [Cu(MeCN)₄]BF₄ (10 mol %) and 1 (1.5 equiv) was reacted in CH₂Cl₂ (0.5 mL) at 40 °C. [b] Yield of the isolated product. [c] The reaction was performed at RT. [d] The ratio of diastereomers was determined by ¹⁹F NMR analysis of the crude reaction mixture.