Table 1.
All reactions conducted in the presence of 20 mol % catalyst 1c, 20 mol % KHMDS (.25M in PhMe) in PhMe for 12 h at 23 °C.
Determined by HPLC using a chiral stationary phase - ee’s in parantheses obtained with catalyst 2c.
Using catalyst 1a, no reaction was observed.
10 mol % 1c and 10 mol % KHMDS.