Table 1. Formation of Multisubstituted Furans (3a) from 2-(Aziridin-2-ylmethylene)malonate (2a) with Various Lewis Acids.
| entry | Lewis acid (1.05 equiv) | time (h) | yield (%) |
|---|---|---|---|
| 1 | BF3·OEt2 | 3.0 | 85 |
| 2 | AlCl3 | 12.0 | 0 |
| 3 | CeCl3 | 4.0 | 0 |
| 4 | I2 | 12 | 0 |
| 5 | FeCl3 | 4.5 | 36 |
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