Table 3.
Attempted Atropisomerism of Gonytolide Dimers
| |||
|---|---|---|---|
| entry | X | conditionsa | results |
| 1 | H | 0.1 equiv. FeCl3, DCE/HFIP 1:1, rt | No reaction |
| 2 | Br | 0.1 equiv. FeCl3, 1.5 equiv. t-BuOOt-Bu, DCE/HFIP 1:1, rt | No reaction |
| 3 | H | 0.1 equiv. 9-mesityl-10-methylacridinium tetra-fluoroborate, CH3CN, 427 nm, rt | Complete decomposition |
| 4 | Br | 0.1 equiv. 9-mesityl-10-methylacridinium tetra-fluoroborate, CH3CN, 427 nm, rt | No reaction |
| 5 | Br | 0.5 equiv. (NH4)2Ce(NO3)6, CH3CN/H2O 1:1, rt | Decomposition |
| 6 | Br | 0.5 equiv. VOF3, TFA/TFAA 20:1, rt | Complete decomposition |
Reaction conducted for 12 h unless specified otherwise.