Table 2.

Effect of the Chiral Auxiliary on Selectivity^a

entry	enamides	products	time [h]	yield [%]b[dr]c
1	3b	4b	14	58 [93:7]
2	3c	4c	12	51 [91:9]
3	3d	4d	12	72 [>95:5]
4	ent-3d	ent-4d	12	63 [>95:5]

^aReaction condition: 1.1 equiv NFSI, 2 % H₂O in CH₃CN, 40 °C; and then, DMP, NaHCO₃, CH₂Cl₂, rt.

^bIsolated yields.

^cDiastereomeric ratios [dr] were determined by ¹H or/and ¹⁹F NMR spectroscopy.