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Visible-Light Photoredox Coupling of (N-Acyloxy)phthalimide 4 with α-(Bromomethyl)styrene (14)
 | ||
|---|---|---|
| Entry | Modification | Yield of 15 (%)a |
| 1 | - | 74 |
| 2 | no light | NDb |
| 3 | no Hantzsch ester 8 | 14 |
| 4 | no photocatalyst (18 h) | 75 |
| 5 | no photocatalyst (2 h) | 11 |
| 6 | 2 h | 76 |
| 7 | acceptor (1 equiv) | 70 |
| 8 | no i-Pr2NEt | 48 |
| 9 | i-Pr2NEt (0.2 equiv) | 55 |
| 10 | i-Pr2NEt (1 equiv) | 62 |
Isolated yield after silica gel chromatography.
Product formation after resubjection to light.
ND = not detected.
