Table 2. Scope of N-Aminopyridinium Salts^a.

entry	salt	E:Z	product	yield (%)
1	2a	E	3a	90
2	2b	6:5	3b	76
3	2c	E	3c	46
4	2d	6:5	3d	74
5	2e	E	3e	48
6	2f	E	3f	74

^aReaction conditions: enol 1a (0.25 mmol), salt 2a–2f (1.3 equiv), dry MeCN (c = 0.05 M), ambient temperature (20–22 °C), 1 h, under an Ar atmosphere, LED light source (446 nm, 6 W). Times: 1 h for 2a, 2b, 2d, and 2f; 2 h for 2c; and 16 h for 2e.