(l)-H-Pro-(l)-Phe-OH (4) were found to be efficient catalysts for direct asymmetric aldol reactions between acetone and various aldehydes. The reaction conditions use a DMSO-NMM-PEMG 5000 system at 0 °C in high yields (62-96%) and enantioselectivities (up to >99% ee).
Telaprevir fragments as organocatalysts in asymmetric direct aldol reactions of aldehydes
作者:Chen Chen Weng、Xinliang Xu、Xiao Xia Xiong、Xiu Lian Lu、Yi Feng Zhou
DOI:10.1134/s1070363213120414
日期:2013.12
We have demonstrated that the fragments of Telaprevir can act as organocatalysts for asymmetric aldol reactions between aromatic aldehydes and acetone under mild conditions. The reaction conditions have been optimized in terms of the catalyst nature, choice of temperature, solvent, additive, and the catalyst loading. Under proper conditions, fairly good yield and enantioselectivity have been achieved.
Chiral biphenylamide derivative: an efficient organocatalyst for the enantioselective synthesis of α-hydroxy phosphonates
The aldol reactions of α-keto phosphonates and aldehydes were facilitated by an axially chiral biphenylprolinamide under mild conditions, affording the synthetically and pharmaceutically useful products in high yields and excellent enantioselectivities.