Table 1.
| ||||
---|---|---|---|---|
Entry | Solvent | Additive (x equiv) | % Yield[a] (O+N)-CP[c] |
Ratio (O:N)-CP[c] |
1 | DMF | Cu(OAc)2·H2O (2) | 89 | 1:1.1 |
2 | DMF | CsOAc (2) | 38 | 1:20 |
3 | MeOH | CsOAc (2) | 97 (92)[b] | 1:20 |
4 | MeOH | CsOAc (0.3) | 97 (90)[b] | 1:20 |
1H NMR yield.
Isolated yield.
CP = Cyclized Product.
Cp* = pentamethylcyclopentadienyl.