Protonated N'-benzyl-N'-l-prolyl-l-proline hydrazide has been developed as a highly enantioselective catalyst for the asymmetric directaldolreaction of aromatic aldehydes with ketones.
<i>trans</i>-4-Hydroxy-<scp>l</scp>-proline Hydrazide-Trifluoroacetic Acid as Highly Stereoselective Organocatalyst for the Asymmetric Direct Aldol Reaction of Cyclohexanone
作者:Jian Sun、Chuanling Cheng、Siyu Wei
DOI:10.1055/s-2006-950431
日期:2006.9
Protonated A,-benzyl-N '-L-prolyl-trans-4-hydroxy-L-proline hydrazide has been found to be superior to the L-proline hydrazide counterpart as the catalyst for the asymmetricaldolreaction of cyclohexanone and aromatic aldehydes, resulting in excellent diastereoselectivities (up to > 99:1 dr) and enantioselectivities (up to > 99% ee).