Table 5.
Yields are reported for isolated and purified products. Yield values reflect the average of duplicate trials.
Reaction for 5 days at 70 °C.
Diastereomeric ratio determined by crude 1H NMR spectroscopy.
Initial 24 h incubation neat at 40 °C. Then C6H6 and DIPEA were added for an additional 24 h at 40 °C.
The reaction was heated to 90 °C.