Table 1 Control experiments.
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Entry Changes from condition A or B Yield of 5a (%) ^("a ")
1 no change from condition A 97% (94%)
2 no change from condition B 88% (84%)
3 no K_(2)CO_(3) under condition A 50%
4 no KOCH_(3) under condition B 13%
5 KF instead of K_(2)CO_(3) under condition A 63%
6 CsF instead of KOCH_(3) under condition B 41%
7 without Et_(3)N or PPh_(3) trace
8 without H_(2)O <54%
9 no light N.D.
10 no light, 60^(@)C N.D.
^("a ") Yield was determined by ^(1) H NMR using 4-bromobenzaldehyde as an internal standard. The value within parentheses refers to isolated yield. | Table 1 Control experiments. | | | |
| :--- | :--- | :--- | :--- |
|  | | | |
| Entry | | Changes from condition A or B | Yield of 5a (%) ${ }^{\text {a }}$ |
| 1 | | no change from condition A | 97% (94%) |
| 2 | | no change from condition B | 88% (84%) |
| 3 | | no $\mathrm{K}_{2} \mathrm{CO}_{3}$ under condition A | 50% |
| 4 | | no $\mathrm{KOCH}_{3}$ under condition B | 13% |
| 5 | | KF instead of $\mathrm{K}_{2} \mathrm{CO}_{3}$ under condition A | 63% |
| 6 | | CsF instead of $\mathrm{KOCH}_{3}$ under condition B | 41% |
| 7 | | without $\mathrm{Et}_{3} \mathrm{~N}$ or $\mathrm{PPh}_{3}$ | trace |
| 8 | | without $\mathrm{H}_{2} \mathrm{O}$ | <54% |
| 9 | | no light | N.D. |
| 10 | | no light, $60^{\circ} \mathrm{C}$ | N.D. |
| ${ }^{\text {a }}$ Yield was determined by ${ }^{1}$ H NMR using 4-bromobenzaldehyde as an internal standard. The value within parentheses refers to isolated yield. | | | |