Table 2.
Entry | R | Solvent | Temp (°C) |
Time (h) |
% Yield (dr)a |
---|---|---|---|---|---|
1 | H | DCM | rt | 12 | trace |
2 | H | DCM | 40 | 12 | trace |
3 | H | DCE | 80 | 12 | trace |
4 | H | THF | rt | 12 | 74 (7:3) |
5 | H | Tol | rt | 12 | 70 (7:3) |
6 | n-Pr | THF | 60 | 1 | 55 (7:3) |
The relative configuration of the major diastereomer is not known.